diff --git a/ext/bg/background.html b/ext/bg/background.html
index 218e9925..b3067b1e 100644
--- a/ext/bg/background.html
+++ b/ext/bg/background.html
@@ -38,7 +38,7 @@
         <script src="/bg/js/json-schema.js"></script>
         <script src="/bg/js/media-utility.js"></script>
         <script src="/bg/js/options.js"></script>
-        <script src="/bg/js/profile-conditions.js"></script>
+        <script src="/bg/js/profile-conditions2.js"></script>
         <script src="/bg/js/request-builder.js"></script>
         <script src="/bg/js/template-renderer.js"></script>
         <script src="/bg/js/text-source-map.js"></script>
diff --git a/ext/bg/css/settings.css b/ext/bg/css/settings.css
index 1b945310..2abcc1b1 100644
--- a/ext/bg/css/settings.css
+++ b/ext/bg/css/settings.css
@@ -68,39 +68,39 @@ html:root:not([data-options-general-result-output-mode=merge]) #dict-main-group
     content: "AND";
 }
 
-.input-group .condition-prefix {
+.condition-prefix {
     flex: 0 0 auto;
 }
-.input-group .condition-prefix,
-.input-group .condition-group-separator-label {
+.condition-prefix,
+.condition-group-separator-label {
     width: 60px;
     text-align: center;
 }
-.input-group .condition-group-separator-label {
+.condition-group-separator-label {
     padding: 6px 12px;
     font-weight: bold;
     display: inline-block;
 }
-.input-group .condition-type,
-.input-group .condition-operator {
+.condition-type,
+.condition-operator {
     width: auto;
     text-align: center;
     text-align-last: center;
 }
 
-.condition-group>.condition>*:first-child,
+.condition-list>.condition>*:first-child,
 .audio-source-list>.audio-source>*:first-child {
     border-bottom-left-radius: 0;
 }
-.condition-group>.condition:nth-child(n+2)>*:first-child,
+.condition-list>.condition:nth-child(n+2)>*:first-child,
 .audio-source-list>.audio-source:nth-child(n+2)>*:first-child {
     border-top-left-radius: 0;
 }
-.condition-group>.condition:nth-child(n+2)>div:last-child>button,
+.condition-list>.condition:nth-child(n+2)>div:last-child>button,
 .audio-source-list>.audio-source:nth-child(n+2)>*:last-child>button {
     border-top-right-radius: 0;
 }
-.condition-group>.condition:nth-last-child(n+2)>div:last-child>button,
+.condition-list>.condition:nth-last-child(n+2)>div:last-child>button,
 .audio-source-list>.audio-source:nth-last-child(n+2)>*:last-child>button {
     border-bottom-right-radius: 0;
 }
@@ -110,7 +110,7 @@ html:root:not([data-options-general-result-output-mode=merge]) #dict-main-group
     border-top-right-radius: 0;
 }
 
-.condition-groups>*:last-of-type {
+.condition-groups>.condition-group:last-child>.condition-group-separator-label {
     display: none;
 }
 
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 810370c4..7f85d9a5 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -28,13 +28,11 @@
  * Mecab
  * ObjectPropertyAccessor
  * OptionsUtil
+ * ProfileConditions
  * RequestBuilder
  * TemplateRenderer
  * Translator
- * conditionsTestValue
  * jp
- * profileConditionsDescriptor
- * profileConditionsDescriptorPromise
  */
 
 class Backend {
@@ -49,6 +47,8 @@ class Backend {
         this._options = null;
         this._optionsSchema = null;
         this._optionsSchemaValidator = new JsonSchemaValidator();
+        this._profileConditionsSchemaCache = [];
+        this._profileConditionsUtil = new ProfileConditions();
         this._defaultAnkiFieldTemplates = null;
         this._requestBuilder = new RequestBuilder();
         this._audioUriBuilder = new AudioUriBuilder({
@@ -200,8 +200,6 @@ class Backend {
             }
             await this._translator.prepare();
 
-            await profileConditionsDescriptorPromise;
-
             this._optionsSchema = await this._fetchAsset('/bg/data/options-schema.json', true);
             this._defaultAnkiFieldTemplates = (await this._fetchAsset('/bg/data/default-anki-field-templates.handlebars')).trim();
             this._options = await OptionsUtil.load();
@@ -397,6 +395,7 @@ class Backend {
     }
 
     async _onApiOptionsSave({source}) {
+        this._clearProfileConditionsSchemaCache();
         const options = this.getFullOptions();
         await OptionsUtil.save(options);
         this._applyOptions(source);
@@ -1006,35 +1005,32 @@ class Backend {
     }
 
     _getProfileFromContext(options, optionsContext) {
+        optionsContext = this._profileConditionsUtil.normalizeContext(optionsContext);
+
+        let index = 0;
         for (const profile of options.profiles) {
             const conditionGroups = profile.conditionGroups;
-            if (conditionGroups.length > 0 && this._testConditionGroups(conditionGroups, optionsContext)) {
+
+            let schema;
+            if (index < this._profileConditionsSchemaCache.length) {
+                schema = this._profileConditionsSchemaCache[index];
+            } else {
+                schema = this._profileConditionsUtil.createSchema(conditionGroups);
+                this._profileConditionsSchemaCache.push(schema);
+            }
+
+            if (conditionGroups.length > 0 && this._optionsSchemaValidator.isValid(optionsContext, schema)) {
                 return profile;
             }
+            ++index;
         }
+
         return null;
     }
 
-    _testConditionGroups(conditionGroups, data) {
-        if (conditionGroups.length === 0) { return false; }
-
-        for (const conditionGroup of conditionGroups) {
-            const conditions = conditionGroup.conditions;
-            if (conditions.length > 0 && this._testConditions(conditions, data)) {
-                return true;
-            }
-        }
-
-        return false;
-    }
-
-    _testConditions(conditions, data) {
-        for (const condition of conditions) {
-            if (!conditionsTestValue(profileConditionsDescriptor, condition.type, condition.operator, condition.value, data)) {
-                return false;
-            }
-        }
-        return true;
+    _clearProfileConditionsSchemaCache() {
+        this._profileConditionsSchemaCache = [];
+        this._optionsSchemaValidator.clearCache();
     }
 
     _checkLastError() {
diff --git a/ext/bg/js/json-schema.js b/ext/bg/js/json-schema.js
index 30446559..1be78fd2 100644
--- a/ext/bg/js/json-schema.js
+++ b/ext/bg/js/json-schema.js
@@ -181,6 +181,10 @@ class JsonSchemaValidator {
         return this._getPropertySchema(schema, property, value, null);
     }
 
+    clearCache() {
+        this._regexCache.clear();
+    }
+
     // Private
 
     _getPropertySchema(schema, property, value, path) {
diff --git a/ext/bg/js/options.js b/ext/bg/js/options.js
index 0d83f428..c513f572 100644
--- a/ext/bg/js/options.js
+++ b/ext/bg/js/options.js
@@ -389,6 +389,10 @@ class OptionsUtil {
             {
                 async: true,
                 update: this._updateVersion3.bind(this)
+            },
+            {
+                async: false,
+                update: this._updateVersion4.bind(this)
             }
         ];
     }
@@ -459,4 +463,22 @@ class OptionsUtil {
         }
         return fieldTemplates;
     }
+
+    static _updateVersion4(options) {
+        // Version 4 changes:
+        //  Options conditions converted to string representations.
+        for (const {conditionGroups} of options.profiles) {
+            for (const {conditions} of conditionGroups) {
+                for (const condition of conditions) {
+                    const value = condition.value;
+                    condition.value = (
+                        Array.isArray(value) ?
+                        value.join(', ') :
+                        `${value}`
+                    );
+                }
+            }
+        }
+        return options;
+    }
 }
diff --git a/ext/bg/js/profile-conditions.js b/ext/bg/js/profile-conditions.js
deleted file mode 100644
index f3a85cb1..00000000
--- a/ext/bg/js/profile-conditions.js
+++ /dev/null
@@ -1,178 +0,0 @@
-/*
- * Copyright (C) 2019-2020  Yomichan Authors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-/* global
- * Environment
- */
-
-let profileConditionsDescriptor = null;
-
-const profileConditionsDescriptorPromise = (async () => {
-    function profileConditionTestDomain(urlDomain, domain) {
-        return (
-            urlDomain.endsWith(domain) &&
-            (
-                domain.length === urlDomain.length ||
-                urlDomain[urlDomain.length - domain.length - 1] === '.'
-            )
-        );
-    }
-
-    function profileConditionTestDomainList(url, domainList) {
-        const urlDomain = new URL(url).hostname.toLowerCase();
-        for (const domain of domainList) {
-            if (profileConditionTestDomain(urlDomain, domain)) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    const environment = new Environment();
-    await environment.prepare();
-
-    const modifiers = environment.getInfo().modifiers;
-    const modifierSeparator = modifiers.separator;
-    const modifierKeyValues = modifiers.keys.map(
-        ({value, name}) => ({optionValue: value, name})
-    );
-
-    const modifierValueToName = new Map(
-        modifierKeyValues.map(({optionValue, name}) => [optionValue, name])
-    );
-
-    const modifierNameToValue = new Map(
-        modifierKeyValues.map(({optionValue, name}) => [name, optionValue])
-    );
-
-    profileConditionsDescriptor = {
-        popupLevel: {
-            name: 'Popup Level',
-            description: 'Use profile depending on the level of the popup.',
-            placeholder: 'Number',
-            type: 'number',
-            step: 1,
-            defaultValue: 0,
-            defaultOperator: 'equal',
-            transform: (optionValue) => parseInt(optionValue, 10),
-            transformReverse: (transformedOptionValue) => `${transformedOptionValue}`,
-            validateTransformed: (transformedOptionValue) => Number.isFinite(transformedOptionValue),
-            operators: {
-                equal: {
-                    name: '=',
-                    test: ({depth}, optionValue) => (depth === optionValue)
-                },
-                notEqual: {
-                    name: '\u2260',
-                    test: ({depth}, optionValue) => (depth !== optionValue)
-                },
-                lessThan: {
-                    name: '<',
-                    test: ({depth}, optionValue) => (depth < optionValue)
-                },
-                greaterThan: {
-                    name: '>',
-                    test: ({depth}, optionValue) => (depth > optionValue)
-                },
-                lessThanOrEqual: {
-                    name: '\u2264',
-                    test: ({depth}, optionValue) => (depth <= optionValue)
-                },
-                greaterThanOrEqual: {
-                    name: '\u2265',
-                    test: ({depth}, optionValue) => (depth >= optionValue)
-                }
-            }
-        },
-        url: {
-            name: 'URL',
-            description: 'Use profile depending on the URL of the current website.',
-            defaultOperator: 'matchDomain',
-            operators: {
-                matchDomain: {
-                    name: 'Matches Domain',
-                    placeholder: 'Comma separated list of domains',
-                    defaultValue: 'example.com',
-                    transformCache: {},
-                    transform: (optionValue) => optionValue.split(/[,;\s]+/).map((v) => v.trim().toLowerCase()).filter((v) => v.length > 0),
-                    transformReverse: (transformedOptionValue) => transformedOptionValue.join(', '),
-                    validateTransformed: (transformedOptionValue) => (transformedOptionValue.length > 0),
-                    test: ({url}, transformedOptionValue) => profileConditionTestDomainList(url, transformedOptionValue)
-                },
-                matchRegExp: {
-                    name: 'Matches RegExp',
-                    placeholder: 'Regular expression',
-                    defaultValue: 'example\\.com',
-                    transformCache: {},
-                    transform: (optionValue) => new RegExp(optionValue, 'i'),
-                    transformReverse: (transformedOptionValue) => transformedOptionValue.source,
-                    test: ({url}, transformedOptionValue) => (transformedOptionValue !== null && transformedOptionValue.test(url))
-                }
-            }
-        },
-        modifierKeys: {
-            name: 'Modifier Keys',
-            description: 'Use profile depending on the active modifier keys.',
-            values: modifierKeyValues,
-            defaultOperator: 'are',
-            operators: {
-                are: {
-                    name: 'are',
-                    placeholder: 'Press one or more modifier keys here',
-                    defaultValue: [],
-                    type: 'keyMulti',
-                    keySeparator: modifierSeparator,
-                    transformInput: (optionValue) => optionValue
-                        .split(modifierSeparator)
-                        .filter((v) => v.length > 0)
-                        .map((v) => modifierNameToValue.get(v)),
-                    transformReverse: (transformedOptionValue) => transformedOptionValue
-                        .map((v) => modifierValueToName.get(v))
-                        .join(modifierSeparator),
-                    test: ({modifierKeys}, optionValue) => areSetsEqual(new Set(modifierKeys), new Set(optionValue))
-                },
-                areNot: {
-                    name: 'are not',
-                    placeholder: 'Press one or more modifier keys here',
-                    defaultValue: [],
-                    type: 'keyMulti',
-                    keySeparator: modifierSeparator,
-                    transformInput: (optionValue) => optionValue
-                        .split(modifierSeparator)
-                        .filter((v) => v.length > 0)
-                        .map((v) => modifierNameToValue.get(v)),
-                    transformReverse: (transformedOptionValue) => transformedOptionValue
-                        .map((v) => modifierValueToName.get(v))
-                        .join(modifierSeparator),
-                    test: ({modifierKeys}, optionValue) => !areSetsEqual(new Set(modifierKeys), new Set(optionValue))
-                },
-                include: {
-                    name: 'include',
-                    type: 'select',
-                    defaultValue: 'alt',
-                    test: ({modifierKeys}, optionValue) => modifierKeys.includes(optionValue)
-                },
-                notInclude: {
-                    name: 'don\'t include',
-                    type: 'select',
-                    defaultValue: 'alt',
-                    test: ({modifierKeys}, optionValue) => !modifierKeys.includes(optionValue)
-                }
-            }
-        }
-    };
-})();
diff --git a/ext/bg/js/settings/conditions-ui.js b/ext/bg/js/settings/conditions-ui.js
deleted file mode 100644
index 98b3d432..00000000
--- a/ext/bg/js/settings/conditions-ui.js
+++ /dev/null
@@ -1,449 +0,0 @@
-/*
- * Copyright (C) 2019-2020  Yomichan Authors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-/* global
- * DocumentUtil
- * conditionsNormalizeOptionValue
- */
-
-class ConditionsUI {
-    static instantiateTemplate(templateSelector) {
-        const template = document.querySelector(templateSelector);
-        const content = document.importNode(template.content, true);
-        return $(content.firstChild);
-    }
-}
-
-ConditionsUI.Container = class Container {
-    constructor(conditionDescriptors, conditionNameDefault, conditionGroups, container, addButton) {
-        this.children = [];
-        this.conditionDescriptors = conditionDescriptors;
-        this.conditionNameDefault = conditionNameDefault;
-        this.conditionGroups = conditionGroups;
-        this.container = container;
-        this.addButton = addButton;
-
-        this.container.empty();
-
-        for (const conditionGroup of toIterable(conditionGroups)) {
-            this.children.push(new ConditionsUI.ConditionGroup(this, conditionGroup));
-        }
-
-        this.addButton.on('click', this.onAddConditionGroup.bind(this));
-    }
-
-    cleanup() {
-        for (const child of this.children) {
-            child.cleanup();
-        }
-
-        this.addButton.off('click');
-        this.container.empty();
-    }
-
-    save() {
-        // Override
-    }
-
-    isolate(object) {
-        // Override
-        return object;
-    }
-
-    remove(child) {
-        const index = this.children.indexOf(child);
-        if (index < 0) {
-            return;
-        }
-
-        child.cleanup();
-        this.children.splice(index, 1);
-        this.conditionGroups.splice(index, 1);
-    }
-
-    onAddConditionGroup() {
-        const conditionGroup = this.isolate({
-            conditions: [this.createDefaultCondition(this.conditionNameDefault)]
-        });
-        this.conditionGroups.push(conditionGroup);
-        this.save();
-        this.children.push(new ConditionsUI.ConditionGroup(this, conditionGroup));
-    }
-
-    createDefaultCondition(type) {
-        let operator = '';
-        let value = '';
-        if (hasOwn(this.conditionDescriptors, type)) {
-            const conditionDescriptor = this.conditionDescriptors[type];
-            operator = conditionDescriptor.defaultOperator;
-            ({value} = this.getOperatorDefaultValue(type, operator));
-            if (typeof value === 'undefined') {
-                value = '';
-            }
-        }
-        return {type, operator, value};
-    }
-
-    getOperatorDefaultValue(type, operator) {
-        if (hasOwn(this.conditionDescriptors, type)) {
-            const conditionDescriptor = this.conditionDescriptors[type];
-            if (hasOwn(conditionDescriptor.operators, operator)) {
-                const operatorDescriptor = conditionDescriptor.operators[operator];
-                if (hasOwn(operatorDescriptor, 'defaultValue')) {
-                    return {value: this.isolate(operatorDescriptor.defaultValue), fromOperator: true};
-                }
-            }
-            if (hasOwn(conditionDescriptor, 'defaultValue')) {
-                return {value: this.isolate(conditionDescriptor.defaultValue), fromOperator: false};
-            }
-        }
-        return {fromOperator: false};
-    }
-};
-
-ConditionsUI.ConditionGroup = class ConditionGroup {
-    constructor(parent, conditionGroup) {
-        this.parent = parent;
-        this.children = [];
-        this.conditionGroup = conditionGroup;
-        this.container = $('<div>').addClass('condition-group').appendTo(parent.container);
-        this.options = ConditionsUI.instantiateTemplate('#condition-group-options-template').appendTo(parent.container);
-        this.separator = ConditionsUI.instantiateTemplate('#condition-group-separator-template').appendTo(parent.container);
-        this.addButton = this.options.find('.condition-add');
-
-        for (const condition of toIterable(conditionGroup.conditions)) {
-            this.children.push(new ConditionsUI.Condition(this, condition));
-        }
-
-        this.addButton.on('click', this.onAddCondition.bind(this));
-    }
-
-    cleanup() {
-        for (const child of this.children) {
-            child.cleanup();
-        }
-
-        this.addButton.off('click');
-        this.container.remove();
-        this.options.remove();
-        this.separator.remove();
-    }
-
-    save() {
-        this.parent.save();
-    }
-
-    isolate(object) {
-        return this.parent.isolate(object);
-    }
-
-    remove(child) {
-        const index = this.children.indexOf(child);
-        if (index < 0) {
-            return;
-        }
-
-        child.cleanup();
-        this.children.splice(index, 1);
-        this.conditionGroup.conditions.splice(index, 1);
-
-        if (this.children.length === 0) {
-            this.parent.remove(this, false);
-        }
-    }
-
-    onAddCondition() {
-        const condition = this.isolate(this.parent.createDefaultCondition(this.parent.conditionNameDefault));
-        this.conditionGroup.conditions.push(condition);
-        this.children.push(new ConditionsUI.Condition(this, condition));
-    }
-};
-
-ConditionsUI.Condition = class Condition {
-    constructor(parent, condition) {
-        this.parent = parent;
-        this.condition = condition;
-        this.container = ConditionsUI.instantiateTemplate('#condition-template').appendTo(parent.container);
-        this.input = this.container.find('.condition-input');
-        this.inputInner = null;
-        this.typeSelect = this.container.find('.condition-type');
-        this.operatorSelect = this.container.find('.condition-operator');
-        this.removeButton = this.container.find('.condition-remove');
-
-        this.updateTypes();
-        this.updateOperators();
-        this.updateInput();
-
-        this.typeSelect.on('change', this.onConditionTypeChanged.bind(this));
-        this.operatorSelect.on('change', this.onConditionOperatorChanged.bind(this));
-        this.removeButton.on('click', this.onRemoveClicked.bind(this));
-    }
-
-    cleanup() {
-        this.inputInner.off('change');
-        this.typeSelect.off('change');
-        this.operatorSelect.off('change');
-        this.removeButton.off('click');
-        this.container.remove();
-    }
-
-    save() {
-        this.parent.save();
-    }
-
-    isolate(object) {
-        return this.parent.isolate(object);
-    }
-
-    updateTypes() {
-        const conditionDescriptors = this.parent.parent.conditionDescriptors;
-        const optionGroup = this.typeSelect.find('optgroup');
-        optionGroup.empty();
-        for (const type of Object.keys(conditionDescriptors)) {
-            const conditionDescriptor = conditionDescriptors[type];
-            $('<option>').val(type).text(conditionDescriptor.name).appendTo(optionGroup);
-        }
-        this.typeSelect.val(this.condition.type);
-    }
-
-    updateOperators() {
-        const conditionDescriptors = this.parent.parent.conditionDescriptors;
-        const optionGroup = this.operatorSelect.find('optgroup');
-        optionGroup.empty();
-
-        const type = this.condition.type;
-        if (hasOwn(conditionDescriptors, type)) {
-            const conditionDescriptor = conditionDescriptors[type];
-            const operators = conditionDescriptor.operators;
-            for (const operatorName of Object.keys(operators)) {
-                const operatorDescriptor = operators[operatorName];
-                $('<option>').val(operatorName).text(operatorDescriptor.name).appendTo(optionGroup);
-            }
-        }
-
-        this.operatorSelect.val(this.condition.operator);
-    }
-
-    updateInput() {
-        const conditionDescriptors = this.parent.parent.conditionDescriptors;
-        const {type, operator} = this.condition;
-
-        const objects = [];
-        let inputType = null;
-        if (hasOwn(conditionDescriptors, type)) {
-            const conditionDescriptor = conditionDescriptors[type];
-            objects.push(conditionDescriptor);
-            if (hasOwn(conditionDescriptor, 'type')) {
-                inputType = conditionDescriptor.type;
-            }
-            if (hasOwn(conditionDescriptor.operators, operator)) {
-                const operatorDescriptor = conditionDescriptor.operators[operator];
-                objects.push(operatorDescriptor);
-                if (hasOwn(operatorDescriptor, 'type')) {
-                    inputType = operatorDescriptor.type;
-                }
-            }
-        }
-
-        this.input.empty();
-        if (inputType === 'select') {
-            this.inputInner = this.createSelectElement(objects);
-        } else if (inputType === 'keyMulti') {
-            this.inputInner = this.createInputKeyMultiElement(objects);
-        } else {
-            this.inputInner = this.createInputElement(objects);
-        }
-        this.inputInner.appendTo(this.input);
-        this.inputInner.on('change', this.onInputChanged.bind(this));
-
-        const {valid, value} = this.validateValue(this.condition.value);
-        this.inputInner.toggleClass('is-invalid', !valid);
-        this.inputInner.val(value);
-    }
-
-    createInputElement(objects) {
-        const inputInner = ConditionsUI.instantiateTemplate('#condition-input-text-template');
-
-        const props = new Map([
-            ['placeholder', ''],
-            ['type', 'text']
-        ]);
-
-        for (const object of objects) {
-            if (hasOwn(object, 'placeholder')) {
-                props.set('placeholder', object.placeholder);
-            }
-            if (object.type === 'number') {
-                props.set('type', 'number');
-                for (const prop of ['step', 'min', 'max']) {
-                    if (hasOwn(object, prop)) {
-                        props.set(prop, object[prop]);
-                    }
-                }
-            }
-        }
-
-        for (const [prop, value] of props.entries()) {
-            inputInner.prop(prop, value);
-        }
-
-        return inputInner;
-    }
-
-    createInputKeyMultiElement(objects) {
-        const inputInner = this.createInputElement(objects);
-
-        inputInner.prop('readonly', true);
-
-        let values = [];
-        let keySeparator = ' + ';
-        for (const object of objects) {
-            if (hasOwn(object, 'values')) {
-                values = object.values;
-            }
-            if (hasOwn(object, 'keySeparator')) {
-                keySeparator = object.keySeparator;
-            }
-        }
-
-        const pressedKeyIndices = new Set();
-
-        const onKeyDown = ({originalEvent}) => {
-            const pressedKeyEventName = DocumentUtil.getKeyFromEvent(originalEvent);
-            if (pressedKeyEventName === 'Escape' || pressedKeyEventName === 'Backspace') {
-                pressedKeyIndices.clear();
-                inputInner.val('');
-                inputInner.change();
-                return;
-            }
-
-            const pressedModifiers = DocumentUtil.getActiveModifiers(originalEvent);
-            // https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/metaKey
-            // https://askubuntu.com/questions/567731/why-is-shift-alt-being-mapped-to-meta
-            // It works with mouse events on some platforms, so try to determine if metaKey is pressed
-            // hack; only works when Shift and Alt are not pressed
-            const isMetaKeyChrome = (
-                pressedKeyEventName === 'Meta' &&
-                getSetDifference(new Set(['shift', 'alt']), pressedModifiers).size !== 0
-            );
-            if (isMetaKeyChrome) {
-                pressedModifiers.add('meta');
-            }
-
-            for (const modifier of pressedModifiers) {
-                const foundIndex = values.findIndex(({optionValue}) => optionValue === modifier);
-                if (foundIndex !== -1) {
-                    pressedKeyIndices.add(foundIndex);
-                }
-            }
-
-            const inputValue = [...pressedKeyIndices].map((i) => values[i].name).join(keySeparator);
-            inputInner.val(inputValue);
-            inputInner.change();
-        };
-
-        inputInner.on('keydown', onKeyDown);
-
-        return inputInner;
-    }
-
-    createSelectElement(objects) {
-        const inputInner = ConditionsUI.instantiateTemplate('#condition-input-select-template');
-
-        const data = new Map([
-            ['values', []],
-            ['defaultValue', null]
-        ]);
-
-        for (const object of objects) {
-            if (hasOwn(object, 'values')) {
-                data.set('values', object.values);
-            }
-            if (hasOwn(object, 'defaultValue')) {
-                data.set('defaultValue', this.isolate(object.defaultValue));
-            }
-        }
-
-        for (const {optionValue, name} of data.get('values')) {
-            const option = ConditionsUI.instantiateTemplate('#condition-input-option-template');
-            option.attr('value', optionValue);
-            option.text(name);
-            option.appendTo(inputInner);
-        }
-
-        const defaultValue = data.get('defaultValue');
-        if (defaultValue !== null) {
-            inputInner.val(this.isolate(defaultValue));
-        }
-
-        return inputInner;
-    }
-
-    validateValue(value, isInput=false) {
-        const conditionDescriptors = this.parent.parent.conditionDescriptors;
-        let valid = true;
-        let inputTransformedValue = null;
-        try {
-            [value, inputTransformedValue] = conditionsNormalizeOptionValue(
-                conditionDescriptors,
-                this.condition.type,
-                this.condition.operator,
-                value,
-                isInput
-            );
-        } catch (e) {
-            valid = false;
-        }
-        return {valid, value, inputTransformedValue};
-    }
-
-    onInputChanged() {
-        const {valid, value, inputTransformedValue} = this.validateValue(this.inputInner.val(), true);
-        this.inputInner.toggleClass('is-invalid', !valid);
-        this.inputInner.val(value);
-        this.condition.value = inputTransformedValue !== null ? inputTransformedValue : value;
-        this.save();
-    }
-
-    onConditionTypeChanged() {
-        const type = this.typeSelect.val();
-        const {operator, value} = this.parent.parent.createDefaultCondition(type);
-        this.condition.type = type;
-        this.condition.operator = operator;
-        this.condition.value = value;
-        this.save();
-        this.updateOperators();
-        this.updateInput();
-    }
-
-    onConditionOperatorChanged() {
-        const type = this.condition.type;
-        const operator = this.operatorSelect.val();
-        const {value, fromOperator} = this.parent.parent.getOperatorDefaultValue(type, operator);
-        this.condition.operator = operator;
-        if (fromOperator) {
-            this.condition.value = value;
-        }
-        this.save();
-        this.updateInput();
-    }
-
-    onRemoveClicked() {
-        this.parent.remove(this);
-        this.save();
-    }
-};
diff --git a/ext/bg/js/settings/profile-conditions-ui.js b/ext/bg/js/settings/profile-conditions-ui.js
new file mode 100644
index 00000000..4f206cc1
--- /dev/null
+++ b/ext/bg/js/settings/profile-conditions-ui.js
@@ -0,0 +1,686 @@
+/*
+ * Copyright (C) 2020  Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* global
+ * DocumentUtil
+ */
+
+class ProfileConditionsUI {
+    constructor(settingsController) {
+        this._settingsController = settingsController;
+        this._keySeparator = '';
+        this._keyNames = new Map();
+        this._conditionGroupsContainer = null;
+        this._addConditionGroupButton = null;
+        this._children = [];
+        this._eventListeners = new EventListenerCollection();
+        this._defaultType = 'popupLevel';
+        this._descriptors = new Map([
+            [
+                'popupLevel',
+                {
+                    displayName: 'Popup Level',
+                    defaultOperator: 'equal',
+                    operators: new Map([
+                        ['equal',              {displayName: '=',      type: 'integer', defaultValue: '0', validate: this._validateInteger.bind(this), normalize: this._normalizeInteger.bind(this)}],
+                        ['notEqual',           {displayName: '\u2260', type: 'integer', defaultValue: '0', validate: this._validateInteger.bind(this), normalize: this._normalizeInteger.bind(this)}],
+                        ['lessThan',           {displayName: '<',      type: 'integer', defaultValue: '0', validate: this._validateInteger.bind(this), normalize: this._normalizeInteger.bind(this)}],
+                        ['greaterThan',        {displayName: '>',      type: 'integer', defaultValue: '0', validate: this._validateInteger.bind(this), normalize: this._normalizeInteger.bind(this)}],
+                        ['lessThanOrEqual',    {displayName: '\u2264', type: 'integer', defaultValue: '0', validate: this._validateInteger.bind(this), normalize: this._normalizeInteger.bind(this)}],
+                        ['greaterThanOrEqual', {displayName: '\u2265', type: 'integer', defaultValue: '0', validate: this._validateInteger.bind(this), normalize: this._normalizeInteger.bind(this)}]
+                    ])
+                }
+            ],
+            [
+                'url',
+                {
+                    displayName: 'URL',
+                    defaultOperator: 'matchDomain',
+                    operators: new Map([
+                        ['matchDomain', {displayName: 'Matches Domain', type: 'string', defaultValue: 'example.com',   resetDefaultOnChange: true, validate: this._validateDomains.bind(this), normalize: this._normalizeDomains.bind(this)}],
+                        ['matchRegExp', {displayName: 'Matches RegExp', type: 'string', defaultValue: 'example\\.com', resetDefaultOnChange: true, validate: this._validateRegExp.bind(this)}]
+                    ])
+                }
+            ],
+            [
+                'modifierKeys',
+                {
+                    displayName: 'Modifier Keys',
+                    defaultOperator: 'are',
+                    operators: new Map([
+                        ['are',        {displayName: 'Are',            type: 'modifierKeys', defaultValue: ''}],
+                        ['areNot',     {displayName: 'Are Not',        type: 'modifierKeys', defaultValue: ''}],
+                        ['include',    {displayName: 'Include',        type: 'modifierKeys', defaultValue: ''}],
+                        ['notInclude', {displayName: 'Don\'t Include', type: 'modifierKeys', defaultValue: ''}]
+                    ])
+                }
+            ]
+        ]);
+    }
+
+    get settingsController() {
+        return this._settingsController;
+    }
+
+    get index() {
+        return this._settingsController.profileIndex;
+    }
+
+    setKeyInfo(separator, keyNames) {
+        this._keySeparator = separator;
+        this._keyNames.clear();
+        for (const {value, name} of keyNames) {
+            this._keyNames.set(value, name);
+        }
+    }
+
+    prepare(conditionGroups) {
+        this._conditionGroupsContainer = document.querySelector('#profile-condition-groups');
+        this._addConditionGroupButton = document.querySelector('#profile-add-condition-group');
+
+        for (let i = 0, ii = conditionGroups.length; i < ii; ++i) {
+            this._addConditionGroup(conditionGroups[i], i);
+        }
+
+        this._eventListeners.addEventListener(this._addConditionGroupButton, 'click', this._onAddConditionGroupButtonClick.bind(this), false);
+    }
+
+    cleanup() {
+        this._eventListeners.removeAllEventListeners();
+
+        for (const child of this._children) {
+            child.cleanup();
+        }
+        this._children = [];
+
+        this._conditionGroupsContainer = null;
+        this._addConditionGroupButton = null;
+    }
+
+    instantiateTemplate(templateSelector) {
+        const template = document.querySelector(templateSelector);
+        const content = document.importNode(template.content, true);
+        return content.firstChild;
+    }
+
+    getDescriptorTypes() {
+        const results = [];
+        for (const [name, {displayName}] of this._descriptors.entries()) {
+            results.push({name, displayName});
+        }
+        return results;
+    }
+
+    getDescriptorOperators(type) {
+        const info = this._descriptors.get(type);
+        const results = [];
+        if (typeof info !== 'undefined') {
+            for (const [name, {displayName}] of info.operators.entries()) {
+                results.push({name, displayName});
+            }
+        }
+        return results;
+    }
+
+    getDefaultType() {
+        return this._defaultType;
+    }
+
+    getDefaultOperator(type) {
+        const info = this._descriptors.get(type);
+        return (typeof info !== 'undefined' ? info.defaultOperator : '');
+    }
+
+    getOperatorDetails(type, operator) {
+        const info = this._getOperatorDetails(type, operator);
+
+        const {
+            displayName=operator,
+            type: type2='string',
+            defaultValue='',
+            resetDefaultOnChange=false,
+            validate=null,
+            normalize=null
+        } = (typeof info === 'undefined' ? {} : info);
+
+        return {
+            displayName,
+            type: type2,
+            defaultValue,
+            resetDefaultOnChange,
+            validate,
+            normalize
+        };
+    }
+
+    getDefaultCondition() {
+        const type = this.getDefaultType();
+        const operator = this.getDefaultOperator(type);
+        const {defaultValue: value} = this.getOperatorDetails(type, operator);
+        return {type, operator, value};
+    }
+
+    removeConditionGroup(child) {
+        const index = child.index;
+        if (index < 0 || index >= this._children.length) { return false; }
+
+        const child2 = this._children[index];
+        if (child !== child2) { return false; }
+
+        this._children.splice(index, 1);
+        child.cleanup();
+
+        for (let i = index, ii = this._children.length; i < ii; ++i) {
+            this._children[i].index = i;
+        }
+
+        this.settingsController.modifyGlobalSettings([{
+            action: 'splice',
+            path: this.getPath('conditionGroups'),
+            start: index,
+            deleteCount: 1,
+            items: []
+        }]);
+
+        return true;
+    }
+
+    splitValue(value) {
+        return value.split(/[,;\s]+/).map((v) => v.trim().toLowerCase()).filter((v) => v.length > 0);
+    }
+
+    getModifierKeyStrings(modifiers) {
+        let value = '';
+        let displayValue = '';
+        let first = true;
+        for (const modifier of modifiers) {
+            let keyName = this._keyNames.get(modifier);
+            if (typeof keyName === 'undefined') { keyName = modifier; }
+
+            if (first) {
+                first = false;
+            } else {
+                value += ', ';
+                displayValue += this._keySeparator;
+            }
+            value += modifier;
+            displayValue += keyName;
+        }
+        return {value, displayValue};
+    }
+
+    sortModifiers(modifiers) {
+        return modifiers.sort();
+    }
+
+    getPath(property) {
+        property = (typeof property === 'string' ? `.${property}` : '');
+        return `profiles[${this.index}]${property}`;
+    }
+
+    // Private
+
+    _onAddConditionGroupButtonClick() {
+        const conditionGroup = {
+            conditions: [this.getDefaultCondition()]
+        };
+        const index = this._children.length;
+
+        this._addConditionGroup(conditionGroup, index);
+
+        this.settingsController.modifyGlobalSettings([{
+            action: 'splice',
+            path: this.getPath('conditionGroups'),
+            start: index,
+            deleteCount: 0,
+            items: [conditionGroup]
+        }]);
+    }
+
+    _addConditionGroup(conditionGroup, index) {
+        const child = new ProfileConditionGroupUI(this, index);
+        child.prepare(conditionGroup);
+        this._children.push(child);
+        this._conditionGroupsContainer.appendChild(child.node);
+        return child;
+    }
+
+    _getOperatorDetails(type, operator) {
+        const info = this._descriptors.get(type);
+        return (typeof info !== 'undefined' ? info.operators.get(operator) : void 0);
+    }
+
+    _validateInteger(value) {
+        const number = Number.parseFloat(value);
+        return Number.isFinite(number) && Math.floor(number) === number;
+    }
+
+    _validateDomains(value) {
+        return this.splitValue(value).length > 0;
+    }
+
+    _validateRegExp(value) {
+        try {
+            new RegExp(value, 'i');
+            return true;
+        } catch (e) {
+            return false;
+        }
+    }
+
+    _normalizeInteger(value) {
+        const number = Number.parseFloat(value);
+        return `${number}`;
+    }
+
+    _normalizeDomains(value) {
+        return this.splitValue(value).join(', ');
+    }
+}
+
+class ProfileConditionGroupUI {
+    constructor(parent, index) {
+        this._parent = parent;
+        this._index = index;
+        this._node = null;
+        this._conditionContainer = null;
+        this._addConditionButton = null;
+        this._children = [];
+        this._eventListeners = new EventListenerCollection();
+    }
+
+    get settingsController() {
+        return this._parent.settingsController;
+    }
+
+    get parent() {
+        return this._parent;
+    }
+
+    get index() {
+        return this._index;
+    }
+
+    set index(value) {
+        this._index = value;
+    }
+
+    get node() {
+        return this._node;
+    }
+
+    prepare(conditionGroup) {
+        this._node = this._parent.instantiateTemplate('#condition-group-template');
+        this._conditionContainer = this._node.querySelector('.condition-list');
+        this._addConditionButton = this._node.querySelector('.condition-add');
+
+        const conditions = conditionGroup.conditions;
+        for (let i = 0, ii = conditions.length; i < ii; ++i) {
+            this._addCondition(conditions[i], i);
+        }
+
+        this._eventListeners.addEventListener(this._addConditionButton, 'click', this._onAddConditionButtonClick.bind(this), false);
+    }
+
+    cleanup() {
+        this._eventListeners.removeAllEventListeners();
+
+        for (const child of this._children) {
+            child.cleanup();
+        }
+        this._children = [];
+
+        if (this._node === null) { return; }
+
+        const node = this._node;
+        this._node = null;
+        this._conditionContainer = null;
+        this._addConditionButton = null;
+
+        if (node.parentNode !== null) {
+            node.parentNode.removeChild(node);
+        }
+    }
+
+    removeCondition(child) {
+        const index = child.index;
+        if (index < 0 || index >= this._children.length) { return false; }
+
+        const child2 = this._children[index];
+        if (child !== child2) { return false; }
+
+        this._children.splice(index, 1);
+        child.cleanup();
+
+        for (let i = index, ii = this._children.length; i < ii; ++i) {
+            this._children[i].index = i;
+        }
+
+        this.settingsController.modifyGlobalSettings([{
+            action: 'splice',
+            path: this.getPath('conditions'),
+            start: index,
+            deleteCount: 1,
+            items: []
+        }]);
+
+        if (this._children.length === 0) {
+            this._parent.removeConditionGroup(this);
+        }
+
+        return true;
+    }
+
+    getPath(property) {
+        property = (typeof property === 'string' ? `.${property}` : '');
+        return this._parent.getPath(`conditionGroups[${this._index}]${property}`);
+    }
+
+    // Private
+
+    _onAddConditionButtonClick() {
+        const condition = this._parent.getDefaultCondition();
+        const index = this._children.length;
+
+        this._addCondition(condition, index);
+
+        this.settingsController.modifyGlobalSettings([{
+            action: 'splice',
+            path: this.getPath('conditions'),
+            start: index,
+            deleteCount: 0,
+            items: [condition]
+        }]);
+    }
+
+    _addCondition(condition, index) {
+        const child = new ProfileConditionUI(this, index);
+        child.prepare(condition);
+        this._children.push(child);
+        this._conditionContainer.appendChild(child.node);
+        return child;
+    }
+}
+
+class ProfileConditionUI {
+    constructor(parent, index) {
+        this._parent = parent;
+        this._index = index;
+        this._node = null;
+        this._typeInput = null;
+        this._operatorInput = null;
+        this._valueInputContainer = null;
+        this._removeButton = null;
+        this._value = '';
+        this._eventListeners = new EventListenerCollection();
+        this._inputEventListeners = new EventListenerCollection();
+    }
+
+    get settingsController() {
+        return this._parent.parent.settingsController;
+    }
+
+    get parent() {
+        return this._parent;
+    }
+
+    get index() {
+        return this._index;
+    }
+
+    set index(value) {
+        this._index = value;
+    }
+
+    get node() {
+        return this._node;
+    }
+
+    prepare(condition) {
+        const {type, operator, value} = condition;
+
+        this._node = this._parent.parent.instantiateTemplate('#condition-template');
+        this._typeInput = this._node.querySelector('.condition-type');
+        this._typeOptionContainer = this._typeInput.querySelector('optgroup');
+        this._operatorInput = this._node.querySelector('.condition-operator');
+        this._operatorOptionContainer = this._operatorInput.querySelector('optgroup');
+        this._valueInput = this._node.querySelector('.condition-input-inner');
+        this._removeButton = this._node.querySelector('.condition-remove');
+
+        const operatorDetails = this._getOperatorDetails(type, operator);
+        this._updateTypes(type);
+        this._updateOperators(type, operator);
+        this._updateValueInput(value, operatorDetails);
+
+        this._eventListeners.addEventListener(this._typeInput, 'change', this._onTypeChange.bind(this), false);
+        this._eventListeners.addEventListener(this._operatorInput, 'change', this._onOperatorChange.bind(this), false);
+        this._eventListeners.addEventListener(this._removeButton, 'click', this._onRemoveButtonClick.bind(this), false);
+    }
+
+    cleanup() {
+        this._eventListeners.removeAllEventListeners();
+        this._value = '';
+
+        if (this._node === null) { return; }
+
+        const node = this._node;
+        this._node = null;
+        this._typeInput = null;
+        this._operatorInput = null;
+        this._valueInputContainer = null;
+        this._removeButton = null;
+
+        if (node.parentNode !== null) {
+            node.parentNode.removeChild(node);
+        }
+    }
+
+    getPath(property) {
+        property = (typeof property === 'string' ? `.${property}` : '');
+        return this._parent.getPath(`conditions[${this._index}]${property}`);
+    }
+
+    // Private
+
+    _onTypeChange(e) {
+        const type = e.currentTarget.value;
+        const operators = this._getDescriptorOperators(type);
+        const operator = operators.length > 0 ? operators[0].name : '';
+        const operatorDetails = this._getOperatorDetails(type, operator);
+        this._updateSelect(this._operatorInput, this._operatorOptionContainer, operators, operator);
+        this._updateValueInput(operatorDetails.defaultValue, operatorDetails);
+        this.settingsController.setGlobalSetting(this.getPath('type'), type);
+    }
+
+    _onOperatorChange(e) {
+        const type = this._typeInput.value;
+        const operator = e.currentTarget.value;
+        const operatorDetails = this._getOperatorDetails(type, operator);
+        if (operatorDetails.resetDefaultOnChange) {
+            const okay = this._updateValueInput(operatorDetails.defaultValue, operatorDetails);
+            if (okay) {
+                this.settingsController.setGlobalSetting(this.getPath('operator'), operator);
+            }
+        }
+    }
+
+    _onValueInputChange({validate, normalize}, e) {
+        const node = e.currentTarget;
+        const value = node.value;
+        const okay = this._validateValue(value, validate);
+        this._value = value;
+        if (okay) {
+            const normalizedValue = this._normalizeValue(value, normalize);
+            node.value = normalizedValue;
+            this.settingsController.setGlobalSetting(this.getPath('value'), normalizedValue);
+        }
+    }
+
+    _onModifierKeyDown({validate, normalize}, e) {
+        e.preventDefault();
+        const node = e.currentTarget;
+
+        let modifiers;
+        const key = DocumentUtil.getKeyFromEvent(e);
+        switch (key) {
+            case 'Escape':
+            case 'Backspace':
+                modifiers = [];
+                break;
+            default:
+                {
+                    modifiers = this._getModifiers(e);
+                    const currentModifier = this._splitValue(this._value);
+                    for (const modifier of currentModifier) {
+                        modifiers.add(modifier);
+                    }
+                    modifiers = [...modifiers];
+                    modifiers = this._sortModifiers(modifiers);
+                }
+                break;
+        }
+
+        const {value, displayValue} = this._getModifierKeyStrings(modifiers);
+        node.value = displayValue;
+        const okay = this._validateValue(value, validate);
+        this._value = value;
+        if (okay) {
+            const normalizedValue = this._normalizeValue(value, normalize);
+            node.value = normalizedValue;
+            this.settingsController.setGlobalSetting(this.getPath('value'), normalizedValue);
+        }
+    }
+
+    _onRemoveButtonClick() {
+        this._parent.removeCondition(this);
+    }
+
+    _getDescriptorTypes() {
+        return this._parent.parent.getDescriptorTypes();
+    }
+
+    _getDescriptorOperators(type) {
+        return this._parent.parent.getDescriptorOperators(type);
+    }
+
+    _getOperatorDetails(type, operator) {
+        return this._parent.parent.getOperatorDetails(type, operator);
+    }
+
+    _getModifierKeyStrings(modifiers) {
+        return this._parent.parent.getModifierKeyStrings(modifiers);
+    }
+
+    _sortModifiers(modifiers) {
+        return this._parent.parent.sortModifiers(modifiers);
+    }
+
+    _splitValue(value) {
+        return this._parent.parent.splitValue(value);
+    }
+
+    _updateTypes(type) {
+        const types = this._getDescriptorTypes();
+        this._updateSelect(this._typeInput, this._typeOptionContainer, types, type);
+    }
+
+    _updateOperators(type, operator) {
+        const operators = this._getDescriptorOperators(type);
+        this._updateSelect(this._operatorInput, this._operatorOptionContainer, operators, operator);
+    }
+
+    _updateSelect(select, optionContainer, values, value) {
+        optionContainer.textContent = '';
+        for (const {name, displayName} of values) {
+            const option = document.createElement('option');
+            option.value = name;
+            option.textContent = displayName;
+            optionContainer.appendChild(option);
+        }
+        select.value = value;
+    }
+
+    _updateValueInput(value, {type, validate, normalize}) {
+        this._inputEventListeners.removeAllEventListeners();
+
+        const inputData = {validate, normalize};
+        const node = this._valueInput;
+        node.classList.remove('is-invalid');
+        this._value = value;
+
+        switch (type) {
+            case 'integer':
+                {
+                    node.type = 'number';
+                    node.step = '1';
+                    node.value = value;
+                    this._inputEventListeners.addEventListener(node, 'change', this._onValueInputChange.bind(this, inputData), false);
+                }
+                break;
+            case 'modifierKeys':
+                {
+                    const modifiers = this._splitValue(value);
+                    const {displayValue} = this._getModifierKeyStrings(modifiers);
+                    node.type = 'text';
+                    node.removeAttribute('step');
+                    node.value = displayValue;
+                    this._inputEventListeners.addEventListener(node, 'keydown', this._onModifierKeyDown.bind(this, inputData), false);
+                }
+                break;
+            default: // 'string'
+                {
+                    node.type = 'text';
+                    node.removeAttribute('step');
+                    node.value = value;
+                    this._inputEventListeners.addEventListener(node, 'change', this._onValueInputChange.bind(this, inputData), false);
+                }
+                break;
+        }
+
+        this._validateValue(value, validate);
+    }
+
+    _validateValue(value, validate) {
+        const okay = (validate === null || validate(value));
+        this._valueInput.classList.toggle('is-invalid', !okay);
+        return okay;
+    }
+
+    _normalizeValue(value, normalize) {
+        return (normalize !== null ? normalize(value) : value);
+    }
+
+    _getModifiers(e) {
+        const modifiers = DocumentUtil.getActiveModifiers(e);
+        // https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/metaKey
+        // https://askubuntu.com/questions/567731/why-is-shift-alt-being-mapped-to-meta
+        // It works with mouse events on some platforms, so try to determine if metaKey is pressed.
+        // This is a hack and only works when both Shift and Alt are not pressed.
+        if (
+            !modifiers.has('meta') &&
+            DocumentUtil.getKeyFromEvent(e) === 'Meta' &&
+            !(
+                modifiers.size === 2 &&
+                modifiers.has('shift') &&
+                modifiers.has('alt')
+            )
+        ) {
+            modifiers.add('meta');
+        }
+        return modifiers;
+    }
+}
diff --git a/ext/bg/js/settings/profiles.js b/ext/bg/js/settings/profiles.js
index 2449ab44..c1961e20 100644
--- a/ext/bg/js/settings/profiles.js
+++ b/ext/bg/js/settings/profiles.js
@@ -16,17 +16,15 @@
  */
 
 /* global
- * ConditionsUI
- * conditionsClearCaches
- * profileConditionsDescriptor
- * profileConditionsDescriptorPromise
+ * ProfileConditionsUI
+ * api
  * utilBackgroundIsolate
  */
 
 class ProfileController {
     constructor(settingsController) {
         this._settingsController = settingsController;
-        this._conditionsContainer = null;
+        this._profileConditionsUI = new ProfileConditionsUI(settingsController);
     }
 
     async prepare() {
@@ -49,8 +47,11 @@ class ProfileController {
     // Private
 
     async _onOptionsChanged() {
+        const {modifiers} = await api.getEnvironmentInfo();
+        this._profileConditionsUI.setKeyInfo(modifiers.separator, modifiers.keys);
+
         const optionsFull = await this._settingsController.getOptionsFullMutable();
-        await this._formWrite(optionsFull);
+        this._formWrite(optionsFull);
     }
 
     _tryGetIntegerValue(selector, min, max) {
@@ -78,7 +79,7 @@ class ProfileController {
         profile.name = $('#profile-name').val();
     }
 
-    async _formWrite(optionsFull) {
+    _formWrite(optionsFull) {
         const currentProfileIndex = this._settingsController.profileIndex;
         const profile = optionsFull.profiles[currentProfileIndex];
 
@@ -91,23 +92,17 @@ class ProfileController {
 
         $('#profile-name').val(profile.name);
 
-        if (this._conditionsContainer !== null) {
-            this._conditionsContainer.cleanup();
-        }
+        this._refreshProfileConditions(optionsFull);
+    }
 
-        await profileConditionsDescriptorPromise;
-        this._conditionsContainer = new ConditionsUI.Container(
-            profileConditionsDescriptor,
-            'popupLevel',
-            profile.conditionGroups,
-            $('#profile-condition-groups'),
-            $('#profile-add-condition-group')
-        );
-        this._conditionsContainer.save = () => {
-            this._settingsController.save();
-            conditionsClearCaches(profileConditionsDescriptor);
-        };
-        this._conditionsContainer.isolate = utilBackgroundIsolate;
+    _refreshProfileConditions(optionsFull) {
+        this._profileConditionsUI.cleanup();
+
+        const profileIndex = this._settingsController.profileIndex;
+        if (profileIndex < 0 || profileIndex >= optionsFull.profiles.length) { return; }
+
+        const {conditionGroups} = optionsFull.profiles[profileIndex];
+        this._profileConditionsUI.prepare(conditionGroups);
     }
 
     _populateSelect(select, profiles, currentValue, ignoreIndices) {
diff --git a/ext/bg/settings.html b/ext/bg/settings.html
index abe3b6aa..f7877dd2 100644
--- a/ext/bg/settings.html
+++ b/ext/bg/settings.html
@@ -112,23 +112,21 @@
                     </div>
                 </div>
 
+                <template id="condition-group-template"><div class="condition-group">
+                    <div class="condition-list"></div>
+                    <div class="condition-group-options">
+                        <button class="btn btn-default condition-add"><span class="glyphicon glyphicon-plus"></span></button>
+                    </div>
+                    <div class="condition-group-separator-label">OR</div>
+                </div></template>
                 <template id="condition-template"><div class="input-group condition">
                     <div class="input-group-addon condition-prefix"></div>
                     <div class="input-group-btn"><select class="form-control btn btn-default condition-type"><optgroup label="Type"></optgroup></select></div>
                     <div class="input-group-btn"><select class="form-control btn btn-default condition-operator"><optgroup label="Operator"></optgroup></select></div>
                     <div class="condition-line-break"></div>
-                    <div class="condition-input"></div>
+                    <div class="condition-input"><input type="text" class="form-control condition-input-inner"></div>
                     <div class="input-group-btn"><button class="btn btn-danger condition-remove" title="Remove"><span class="glyphicon glyphicon-remove"></span></button></div>
                 </div></template>
-                <template id="condition-group-separator-template"><div class="input-group">
-                    <div class="condition-group-separator-label">OR</div>
-                </div></template>
-                <template id="condition-group-options-template"><div class="condition-group-options">
-                    <button class="btn btn-default condition-add"><span class="glyphicon glyphicon-plus"></span></button>
-                </div></template>
-                <template id="condition-input-text-template"><input type="text" class="form-control condition-input-inner" /></template>
-                <template id="condition-input-select-template"><select class="form-control condition-input-inner"></select></template>
-                <template id="condition-input-option-template"><option></option></template>
             </div>
 
             <div>
@@ -1143,7 +1141,6 @@
         <script src="/bg/js/anki-note-builder.js"></script>
         <script src="/bg/js/conditions.js"></script>
         <script src="/bg/js/options.js"></script>
-        <script src="/bg/js/profile-conditions.js"></script>
         <script src="/bg/js/util.js"></script>
         <script src="/mixed/js/audio-system.js"></script>
         <script src="/mixed/js/document-util.js"></script>
@@ -1153,11 +1150,11 @@
         <script src="/bg/js/settings/audio.js"></script>
         <script src="/bg/js/settings/backup.js"></script>
         <script src="/bg/js/settings/clipboard-popups-controller.js"></script>
-        <script src="/bg/js/settings/conditions-ui.js"></script>
         <script src="/bg/js/settings/dictionaries.js"></script>
         <script src="/bg/js/settings/generic-setting-controller.js"></script>
         <script src="/bg/js/settings/popup-preview.js"></script>
         <script src="/bg/js/settings/profiles.js"></script>
+        <script src="/bg/js/settings/profile-conditions-ui.js"></script>
         <script src="/bg/js/settings/settings-controller.js"></script>
         <script src="/bg/js/settings/storage.js"></script>
         <script src="/mixed/js/dictionary-data-util.js"></script>