diff --git a/ext/bg/js/api.js b/ext/bg/js/api.js
index 9839aef5..81772d08 100644
--- a/ext/bg/js/api.js
+++ b/ext/bg/js/api.js
@@ -17,16 +17,19 @@
  */
 
 
-function apiOptionsGetSync() {
-    return utilBackend().options;
+function apiOptionsGet(optionsContext) {
+    return utilBackend().getOptions(optionsContext);
 }
 
-async function apiOptionsGet() {
-    return apiOptionsGetSync();
+async function apiOptionsSave(source) {
+    const backend = utilBackend();
+    const options = await backend.getFullOptions();
+    await optionsSave(options);
+    backend.onOptionsUpdated(source);
 }
 
-async function apiTermsFind(text) {
-    const options = apiOptionsGetSync();
+async function apiTermsFind(text, optionsContext) {
+    const options = await apiOptionsGet(optionsContext);
     const translator = utilBackend().translator;
 
     const searcher = {
@@ -38,7 +41,8 @@ async function apiTermsFind(text) {
     const {definitions, length} = await searcher(
         text,
         dictEnabledSet(options),
-        options.scanning.alphanumeric
+        options.scanning.alphanumeric,
+        options
     );
 
     return {
@@ -47,14 +51,14 @@ async function apiTermsFind(text) {
     };
 }
 
-async function apiKanjiFind(text) {
-    const options = apiOptionsGetSync();
+async function apiKanjiFind(text, optionsContext) {
+    const options = await apiOptionsGet(optionsContext);
     const definitions = await utilBackend().translator.findKanji(text, dictEnabledSet(options));
     return definitions.slice(0, options.general.maxResults);
 }
 
-async function apiDefinitionAdd(definition, mode, context) {
-    const options = apiOptionsGetSync();
+async function apiDefinitionAdd(definition, mode, context, optionsContext) {
+    const options = await apiOptionsGet(optionsContext);
 
     if (mode !== 'kanji') {
         await audioInject(
@@ -76,14 +80,15 @@ async function apiDefinitionAdd(definition, mode, context) {
     return utilBackend().anki.addNote(note);
 }
 
-async function apiDefinitionsAddable(definitions, modes) {
+async function apiDefinitionsAddable(definitions, modes, optionsContext) {
+    const options = await apiOptionsGet(optionsContext);
     const states = [];
 
     try {
         const notes = [];
         for (const definition of definitions) {
             for (const mode of modes) {
-                const note = await dictNoteFormat(definition, mode, apiOptionsGetSync());
+                const note = await dictNoteFormat(definition, mode, options);
                 notes.push(note);
             }
         }
@@ -131,9 +136,10 @@ async function apiCommandExec(command) {
         },
 
         toggle: async () => {
-            const options = apiOptionsGetSync();
+            const optionsContext = {depth: 0};
+            const options = await apiOptionsGet(optionsContext);
             options.general.enable = !options.general.enable;
-            await optionsSave(options);
+            await apiOptionsSave('popup');
         }
     };
 
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index b3e737da..9a300d62 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -22,44 +22,43 @@ class Backend {
         this.translator = new Translator();
         this.anki = new AnkiNull();
         this.options = null;
+        this.optionsContext = {
+            depth: 0
+        };
+
+        this.isPreparedResolve = null;
+        this.isPreparedPromise = new Promise((resolve) => (this.isPreparedResolve = resolve));
 
         this.apiForwarder = new BackendApiForwarder();
     }
 
     async prepare() {
         await this.translator.prepare();
-        this.onOptionsUpdated(await optionsLoad());
+        this.options = await optionsLoad();
+        this.onOptionsUpdated('background');
 
         if (chrome.commands !== null && typeof chrome.commands === 'object') {
             chrome.commands.onCommand.addListener(this.onCommand.bind(this));
         }
         chrome.runtime.onMessage.addListener(this.onMessage.bind(this));
 
-        if (this.options.general.showGuide) {
+        const options = this.getOptionsSync(this.optionsContext);
+        if (options.general.showGuide) {
             chrome.tabs.create({url: chrome.extension.getURL('/bg/guide.html')});
         }
+
+        this.isPreparedResolve();
+        this.isPreparedResolve = null;
+        this.isPreparedPromise = null;
     }
 
-    onOptionsUpdated(options) {
-        options = utilIsolate(options);
-        this.options = options;
-
-        if (!options.general.enable) {
-            this.setExtensionBadgeBackgroundColor('#555555');
-            this.setExtensionBadgeText('off');
-        } else if (!dictConfigured(options)) {
-            this.setExtensionBadgeBackgroundColor('#f0ad4e');
-            this.setExtensionBadgeText('!');
-        } else {
-            this.setExtensionBadgeText('');
-        }
-
-        this.anki = options.anki.enable ? new AnkiConnect(options.anki.server) : new AnkiNull();
+    onOptionsUpdated(source) {
+        this.applyOptions();
 
         const callback = () => this.checkLastError(chrome.runtime.lastError);
         chrome.tabs.query({}, tabs => {
             for (const tab of tabs) {
-                chrome.tabs.sendMessage(tab.id, {action: 'optionsSet', params: {options}}, callback);
+                chrome.tabs.sendMessage(tab.id, {action: 'optionsUpdate', params: {source}}, callback);
             }
         });
     }
@@ -78,24 +77,24 @@ class Backend {
         };
 
         const handlers = {
-            optionsGet: ({callback}) => {
-                forward(apiOptionsGet(), callback);
+            optionsGet: ({optionsContext, callback}) => {
+                forward(apiOptionsGet(optionsContext), callback);
             },
 
-            kanjiFind: ({text, callback}) => {
-                forward(apiKanjiFind(text), callback);
+            kanjiFind: ({text, optionsContext, callback}) => {
+                forward(apiKanjiFind(text, optionsContext), callback);
             },
 
-            termsFind: ({text, callback}) => {
-                forward(apiTermsFind(text), callback);
+            termsFind: ({text, optionsContext, callback}) => {
+                forward(apiTermsFind(text, optionsContext), callback);
             },
 
-            definitionAdd: ({definition, mode, context, callback}) => {
-                forward(apiDefinitionAdd(definition, mode, context), callback);
+            definitionAdd: ({definition, mode, context, optionsContext, callback}) => {
+                forward(apiDefinitionAdd(definition, mode, context, optionsContext), callback);
             },
 
-            definitionsAddable: ({definitions, modes, callback}) => {
-                forward(apiDefinitionsAddable(definitions, modes), callback);
+            definitionsAddable: ({definitions, modes, optionsContext, callback}) => {
+                forward(apiDefinitionsAddable(definitions, modes, optionsContext), callback);
             },
 
             noteView: ({noteId}) => {
@@ -136,6 +135,39 @@ class Backend {
         return true;
     }
 
+    applyOptions() {
+        const options = this.getOptionsSync(this.optionsContext);
+        if (!options.general.enable) {
+            this.setExtensionBadgeBackgroundColor('#555555');
+            this.setExtensionBadgeText('off');
+        } else if (!dictConfigured(options)) {
+            this.setExtensionBadgeBackgroundColor('#f0ad4e');
+            this.setExtensionBadgeText('!');
+        } else {
+            this.setExtensionBadgeText('');
+        }
+
+        this.anki = options.anki.enable ? new AnkiConnect(options.anki.server) : new AnkiNull();
+    }
+
+    async getFullOptions() {
+        if (this.isPreparedPromise !== null) {
+            await this.isPreparedPromise;
+        }
+        return this.options;
+    }
+
+    async getOptions(optionsContext) {
+        if (this.isPreparedPromise !== null) {
+            await this.isPreparedPromise;
+        }
+        return this.getOptionsSync(optionsContext);
+    }
+
+    getOptionsSync(optionsContext) {
+        return this.options;
+    }
+
     setExtensionBadgeBackgroundColor(color) {
         if (typeof chrome.browserAction.setBadgeBackgroundColor === 'function') {
             chrome.browserAction.setBadgeBackgroundColor({color});
diff --git a/ext/bg/js/context.js b/ext/bg/js/context.js
index 689d6863..dfa224a7 100644
--- a/ext/bg/js/context.js
+++ b/ext/bg/js/context.js
@@ -22,7 +22,8 @@ $(document).ready(utilAsync(() => {
     $('#open-options').click(() => apiCommandExec('options'));
     $('#open-help').click(() => apiCommandExec('help'));
 
-    optionsLoad().then(options => {
+    const optionsContext = {depth: 0};
+    apiOptionsGet(optionsContext).then(options => {
         const toggle = $('#enable-search');
         toggle.prop('checked', options.general.enable).change();
         toggle.bootstrapToggle();
diff --git a/ext/bg/js/options.js b/ext/bg/js/options.js
index 69c662e6..d093d0b4 100644
--- a/ext/bg/js/options.js
+++ b/ext/bg/js/options.js
@@ -330,7 +330,7 @@ function optionsLoad() {
     }).then(optionsStr => {
         if (typeof optionsStr === 'string') {
             const options = JSON.parse(optionsStr);
-            if (typeof options === 'object' && options !== null && !Array.isArray(options)) {
+            if (utilIsObject(options)) {
                 return options;
             }
         }
@@ -343,9 +343,14 @@ function optionsLoad() {
 }
 
 function optionsSave(options) {
-    return new Promise((resolve) => {
-        chrome.storage.local.set({options: JSON.stringify(options)}, resolve);
-    }).then(() => {
-        utilBackend().onOptionsUpdated(options);
+    return new Promise((resolve, reject) => {
+        chrome.storage.local.set({options: JSON.stringify(options)}, () => {
+            const error = chrome.runtime.lastError;
+            if (error) {
+                reject(error);
+            } else {
+                resolve();
+            }
+        });
     });
 }
diff --git a/ext/bg/js/search-frontend.js b/ext/bg/js/search-frontend.js
index 840a1ea8..df5ccf81 100644
--- a/ext/bg/js/search-frontend.js
+++ b/ext/bg/js/search-frontend.js
@@ -18,7 +18,8 @@
 
 
 async function searchFrontendSetup() {
-    const options = await apiOptionsGet();
+    const optionsContext = {depth: 0};
+    const options = await apiOptionsGet(optionsContext);
     if (!options.scanning.enableOnSearchPage) { return; }
 
     const scriptSrcs = [
diff --git a/ext/bg/js/search.js b/ext/bg/js/search.js
index a3382398..6bdc47d8 100644
--- a/ext/bg/js/search.js
+++ b/ext/bg/js/search.js
@@ -21,6 +21,10 @@ class DisplaySearch extends Display {
     constructor() {
         super($('#spinner'), $('#content'));
 
+        this.optionsContext = {
+            depth: 0
+        };
+
         this.search = $('#search').click(this.onSearch.bind(this));
         this.query = $('#query').on('input', this.onSearchInput.bind(this));
         this.intro = $('#intro');
@@ -46,8 +50,8 @@ class DisplaySearch extends Display {
         try {
             e.preventDefault();
             this.intro.slideUp();
-            const {length, definitions} = await apiTermsFind(this.query.val());
-            super.termsShow(definitions, await apiOptionsGet());
+            const {length, definitions} = await apiTermsFind(this.query.val(), this.optionsContext);
+            super.termsShow(definitions, await apiOptionsGet(this.optionsContext));
         } catch (e) {
             this.onError(e);
         }
diff --git a/ext/bg/js/settings.js b/ext/bg/js/settings.js
index 83f4528c..7f3e5c69 100644
--- a/ext/bg/js/settings.js
+++ b/ext/bg/js/settings.js
@@ -16,73 +16,144 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+function getOptionsContext() {
+    return {
+        depth: 0
+    };
+}
 
-async function formRead() {
-    const optionsOld = await optionsLoad();
-    const optionsNew = $.extend(true, {}, optionsOld);
+async function formRead(options) {
+    options.general.enable = $('#enable').prop('checked');
+    options.general.showGuide = $('#show-usage-guide').prop('checked');
+    options.general.compactTags = $('#compact-tags').prop('checked');
+    options.general.compactGlossaries = $('#compact-glossaries').prop('checked');
+    options.general.autoPlayAudio = $('#auto-play-audio').prop('checked');
+    options.general.resultOutputMode = $('#result-output-mode').val();
+    options.general.audioSource = $('#audio-playback-source').val();
+    options.general.audioVolume = parseFloat($('#audio-playback-volume').val());
+    options.general.debugInfo = $('#show-debug-info').prop('checked');
+    options.general.showAdvanced = $('#show-advanced-options').prop('checked');
+    options.general.maxResults = parseInt($('#max-displayed-results').val(), 10);
+    options.general.popupDisplayMode = $('#popup-display-mode').val();
+    options.general.popupHorizontalTextPosition = $('#popup-horizontal-text-position').val();
+    options.general.popupVerticalTextPosition = $('#popup-vertical-text-position').val();
+    options.general.popupWidth = parseInt($('#popup-width').val(), 10);
+    options.general.popupHeight = parseInt($('#popup-height').val(), 10);
+    options.general.popupHorizontalOffset = parseInt($('#popup-horizontal-offset').val(), 0);
+    options.general.popupVerticalOffset = parseInt($('#popup-vertical-offset').val(), 10);
+    options.general.popupHorizontalOffset2 = parseInt($('#popup-horizontal-offset2').val(), 0);
+    options.general.popupVerticalOffset2 = parseInt($('#popup-vertical-offset2').val(), 10);
+    options.general.customPopupCss = $('#custom-popup-css').val();
 
-    optionsNew.general.showGuide = $('#show-usage-guide').prop('checked');
-    optionsNew.general.compactTags = $('#compact-tags').prop('checked');
-    optionsNew.general.compactGlossaries = $('#compact-glossaries').prop('checked');
-    optionsNew.general.autoPlayAudio = $('#auto-play-audio').prop('checked');
-    optionsNew.general.resultOutputMode = $('#result-output-mode').val();
-    optionsNew.general.audioSource = $('#audio-playback-source').val();
-    optionsNew.general.audioVolume = parseFloat($('#audio-playback-volume').val());
-    optionsNew.general.debugInfo = $('#show-debug-info').prop('checked');
-    optionsNew.general.showAdvanced = $('#show-advanced-options').prop('checked');
-    optionsNew.general.maxResults = parseInt($('#max-displayed-results').val(), 10);
-    optionsNew.general.popupDisplayMode = $('#popup-display-mode').val();
-    optionsNew.general.popupHorizontalTextPosition = $('#popup-horizontal-text-position').val();
-    optionsNew.general.popupVerticalTextPosition = $('#popup-vertical-text-position').val();
-    optionsNew.general.popupWidth = parseInt($('#popup-width').val(), 10);
-    optionsNew.general.popupHeight = parseInt($('#popup-height').val(), 10);
-    optionsNew.general.popupHorizontalOffset = parseInt($('#popup-horizontal-offset').val(), 0);
-    optionsNew.general.popupVerticalOffset = parseInt($('#popup-vertical-offset').val(), 10);
-    optionsNew.general.popupHorizontalOffset2 = parseInt($('#popup-horizontal-offset2').val(), 0);
-    optionsNew.general.popupVerticalOffset2 = parseInt($('#popup-vertical-offset2').val(), 10);
-    optionsNew.general.customPopupCss = $('#custom-popup-css').val();
+    options.scanning.middleMouse = $('#middle-mouse-button-scan').prop('checked');
+    options.scanning.touchInputEnabled = $('#touch-input-enabled').prop('checked');
+    options.scanning.selectText = $('#select-matched-text').prop('checked');
+    options.scanning.alphanumeric = $('#search-alphanumeric').prop('checked');
+    options.scanning.autoHideResults = $('#auto-hide-results').prop('checked');
+    options.scanning.deepDomScan = $('#deep-dom-scan').prop('checked');
+    options.scanning.enableOnPopupExpressions = $('#enable-scanning-of-popup-expressions').prop('checked');
+    options.scanning.enableOnSearchPage = $('#enable-scanning-on-search-page').prop('checked');
+    options.scanning.delay = parseInt($('#scan-delay').val(), 10);
+    options.scanning.length = parseInt($('#scan-length').val(), 10);
+    options.scanning.modifier = $('#scan-modifier-key').val();
+    options.scanning.popupNestingMaxDepth = parseInt($('#popup-nesting-max-depth').val(), 10);
 
-    optionsNew.scanning.middleMouse = $('#middle-mouse-button-scan').prop('checked');
-    optionsNew.scanning.touchInputEnabled = $('#touch-input-enabled').prop('checked');
-    optionsNew.scanning.selectText = $('#select-matched-text').prop('checked');
-    optionsNew.scanning.alphanumeric = $('#search-alphanumeric').prop('checked');
-    optionsNew.scanning.autoHideResults = $('#auto-hide-results').prop('checked');
-    optionsNew.scanning.deepDomScan = $('#deep-dom-scan').prop('checked');
-    optionsNew.scanning.enableOnPopupExpressions = $('#enable-scanning-of-popup-expressions').prop('checked');
-    optionsNew.scanning.enableOnSearchPage = $('#enable-scanning-on-search-page').prop('checked');
-    optionsNew.scanning.delay = parseInt($('#scan-delay').val(), 10);
-    optionsNew.scanning.length = parseInt($('#scan-length').val(), 10);
-    optionsNew.scanning.modifier = $('#scan-modifier-key').val();
-    optionsNew.scanning.popupNestingMaxDepth = parseInt($('#popup-nesting-max-depth').val(), 10);
+    const optionsAnkiEnableOld = options.anki.enable;
+    options.anki.enable = $('#anki-enable').prop('checked');
+    options.anki.tags = $('#card-tags').val().split(/[,; ]+/);
+    options.anki.sentenceExt = parseInt($('#sentence-detection-extent').val(), 10);
+    options.anki.server = $('#interface-server').val();
+    options.anki.screenshot.format = $('#screenshot-format').val();
+    options.anki.screenshot.quality = parseInt($('#screenshot-quality').val(), 10);
+    options.anki.fieldTemplates = $('#field-templates').val();
 
-    optionsNew.anki.enable = $('#anki-enable').prop('checked');
-    optionsNew.anki.tags = $('#card-tags').val().split(/[,; ]+/);
-    optionsNew.anki.sentenceExt = parseInt($('#sentence-detection-extent').val(), 10);
-    optionsNew.anki.server = $('#interface-server').val();
-    optionsNew.anki.screenshot.format = $('#screenshot-format').val();
-    optionsNew.anki.screenshot.quality = parseInt($('#screenshot-quality').val(), 10);
-    optionsNew.anki.fieldTemplates = $('#field-templates').val();
-
-    if (optionsOld.anki.enable && !ankiErrorShown()) {
-        optionsNew.anki.terms.deck = $('#anki-terms-deck').val();
-        optionsNew.anki.terms.model = $('#anki-terms-model').val();
-        optionsNew.anki.terms.fields = ankiFieldsToDict($('#terms .anki-field-value'));
-        optionsNew.anki.kanji.deck = $('#anki-kanji-deck').val();
-        optionsNew.anki.kanji.model = $('#anki-kanji-model').val();
-        optionsNew.anki.kanji.fields = ankiFieldsToDict($('#kanji .anki-field-value'));
+    if (optionsAnkiEnableOld && !ankiErrorShown()) {
+        options.anki.terms.deck = $('#anki-terms-deck').val();
+        options.anki.terms.model = $('#anki-terms-model').val();
+        options.anki.terms.fields = ankiFieldsToDict($('#terms .anki-field-value'));
+        options.anki.kanji.deck = $('#anki-kanji-deck').val();
+        options.anki.kanji.model = $('#anki-kanji-model').val();
+        options.anki.kanji.fields = ankiFieldsToDict($('#kanji .anki-field-value'));
     }
 
-    optionsNew.general.mainDictionary = $('#dict-main').val();
+    options.general.mainDictionary = $('#dict-main').val();
     $('.dict-group').each((index, element) => {
         const dictionary = $(element);
-        optionsNew.dictionaries[dictionary.data('title')] = {
+        options.dictionaries[dictionary.data('title')] = {
             priority: parseInt(dictionary.find('.dict-priority').val(), 10),
             enabled: dictionary.find('.dict-enabled').prop('checked'),
             allowSecondarySearches: dictionary.find('.dict-allow-secondary-searches').prop('checked')
         };
     });
+}
 
-    return {optionsNew, optionsOld};
+async function formWrite(options) {
+    $('#enable').prop('checked', options.general.enable);
+    $('#show-usage-guide').prop('checked', options.general.showGuide);
+    $('#compact-tags').prop('checked', options.general.compactTags);
+    $('#compact-glossaries').prop('checked', options.general.compactGlossaries);
+    $('#auto-play-audio').prop('checked', options.general.autoPlayAudio);
+    $('#result-output-mode').val(options.general.resultOutputMode);
+    $('#audio-playback-source').val(options.general.audioSource);
+    $('#audio-playback-volume').val(options.general.audioVolume);
+    $('#show-debug-info').prop('checked', options.general.debugInfo);
+    $('#show-advanced-options').prop('checked', options.general.showAdvanced);
+    $('#max-displayed-results').val(options.general.maxResults);
+    $('#popup-display-mode').val(options.general.popupDisplayMode);
+    $('#popup-horizontal-text-position').val(options.general.popupHorizontalTextPosition);
+    $('#popup-vertical-text-position').val(options.general.popupVerticalTextPosition);
+    $('#popup-width').val(options.general.popupWidth);
+    $('#popup-height').val(options.general.popupHeight);
+    $('#popup-horizontal-offset').val(options.general.popupHorizontalOffset);
+    $('#popup-vertical-offset').val(options.general.popupVerticalOffset);
+    $('#popup-horizontal-offset2').val(options.general.popupHorizontalOffset2);
+    $('#popup-vertical-offset2').val(options.general.popupVerticalOffset2);
+    $('#custom-popup-css').val(options.general.customPopupCss);
+
+    $('#middle-mouse-button-scan').prop('checked', options.scanning.middleMouse);
+    $('#touch-input-enabled').prop('checked', options.scanning.touchInputEnabled);
+    $('#select-matched-text').prop('checked', options.scanning.selectText);
+    $('#search-alphanumeric').prop('checked', options.scanning.alphanumeric);
+    $('#auto-hide-results').prop('checked', options.scanning.autoHideResults);
+    $('#deep-dom-scan').prop('checked', options.scanning.deepDomScan);
+    $('#enable-scanning-of-popup-expressions').prop('checked', options.scanning.enableOnPopupExpressions);
+    $('#enable-scanning-on-search-page').prop('checked', options.scanning.enableOnSearchPage);
+    $('#scan-delay').val(options.scanning.delay);
+    $('#scan-length').val(options.scanning.length);
+    $('#scan-modifier-key').val(options.scanning.modifier);
+    $('#popup-nesting-max-depth').val(options.scanning.popupNestingMaxDepth);
+
+    $('#anki-enable').prop('checked', options.anki.enable);
+    $('#card-tags').val(options.anki.tags.join(' '));
+    $('#sentence-detection-extent').val(options.anki.sentenceExt);
+    $('#interface-server').val(options.anki.server);
+    $('#screenshot-format').val(options.anki.screenshot.format);
+    $('#screenshot-quality').val(options.anki.screenshot.quality);
+    $('#field-templates').val(options.anki.fieldTemplates);
+
+    try {
+        await dictionaryGroupsPopulate(options);
+        await formMainDictionaryOptionsPopulate(options);
+    } catch (e) {
+        dictionaryErrorsShow([e]);
+    }
+
+    try {
+        await ankiDeckAndModelPopulate(options);
+    } catch (e) {
+        ankiErrorShow(e);
+    }
+
+    formUpdateVisibility(options);
+}
+
+function formSetupEventListeners() {
+    $('#dict-purge-link').click(utilAsync(onDictionaryPurge));
+    $('#dict-file').change(utilAsync(onDictionaryImport));
+
+    $('#field-templates-reset').click(utilAsync(onAnkiFieldTemplatesReset));
+    $('input, select, textarea').not('.anki-model').not('.profile-form *').change(utilAsync(onFormOptionsChanged));
+    $('.anki-model').change(utilAsync(onAnkiModelChanged));
 }
 
 function formUpdateVisibility(options) {
@@ -141,18 +212,23 @@ async function onFormOptionsChanged(e) {
         return;
     }
 
-    const {optionsNew, optionsOld} = await formRead();
-    await optionsSave(optionsNew);
-    formUpdateVisibility(optionsNew);
+    const optionsContext = getOptionsContext();
+    const options = await apiOptionsGet(optionsContext);
+    const optionsAnkiEnableOld = options.anki.enable;
+    const optionsAnkiServerOld = options.anki.server;
+
+    await formRead(options);
+    await settingsSaveOptions();
+    formUpdateVisibility(options);
 
     try {
         const ankiUpdated =
-            optionsNew.anki.enable !== optionsOld.anki.enable ||
-            optionsNew.anki.server !== optionsOld.anki.server;
+            options.anki.enable !== optionsAnkiEnableOld ||
+            options.anki.server !== optionsAnkiServerOld;
 
         if (ankiUpdated) {
             ankiSpinnerShow(true);
-            await ankiDeckAndModelPopulate(optionsNew);
+            await ankiDeckAndModelPopulate(options);
             ankiErrorShow();
         }
     } catch (e) {
@@ -163,77 +239,51 @@ async function onFormOptionsChanged(e) {
 }
 
 async function onReady() {
-    const options = await optionsLoad();
+    const optionsContext = getOptionsContext();
+    const options = await apiOptionsGet(optionsContext);
 
-    $('#show-usage-guide').prop('checked', options.general.showGuide);
-    $('#compact-tags').prop('checked', options.general.compactTags);
-    $('#compact-glossaries').prop('checked', options.general.compactGlossaries);
-    $('#auto-play-audio').prop('checked', options.general.autoPlayAudio);
-    $('#result-output-mode').val(options.general.resultOutputMode);
-    $('#audio-playback-source').val(options.general.audioSource);
-    $('#audio-playback-volume').val(options.general.audioVolume);
-    $('#show-debug-info').prop('checked', options.general.debugInfo);
-    $('#show-advanced-options').prop('checked', options.general.showAdvanced);
-    $('#max-displayed-results').val(options.general.maxResults);
-    $('#popup-display-mode').val(options.general.popupDisplayMode);
-    $('#popup-horizontal-text-position').val(options.general.popupHorizontalTextPosition);
-    $('#popup-vertical-text-position').val(options.general.popupVerticalTextPosition);
-    $('#popup-width').val(options.general.popupWidth);
-    $('#popup-height').val(options.general.popupHeight);
-    $('#popup-horizontal-offset').val(options.general.popupHorizontalOffset);
-    $('#popup-vertical-offset').val(options.general.popupVerticalOffset);
-    $('#popup-horizontal-offset2').val(options.general.popupHorizontalOffset2);
-    $('#popup-vertical-offset2').val(options.general.popupVerticalOffset2);
-    $('#custom-popup-css').val(options.general.customPopupCss);
-
-    $('#middle-mouse-button-scan').prop('checked', options.scanning.middleMouse);
-    $('#touch-input-enabled').prop('checked', options.scanning.touchInputEnabled);
-    $('#select-matched-text').prop('checked', options.scanning.selectText);
-    $('#search-alphanumeric').prop('checked', options.scanning.alphanumeric);
-    $('#auto-hide-results').prop('checked', options.scanning.autoHideResults);
-    $('#deep-dom-scan').prop('checked', options.scanning.deepDomScan);
-    $('#enable-scanning-of-popup-expressions').prop('checked', options.scanning.enableOnPopupExpressions);
-    $('#enable-scanning-on-search-page').prop('checked', options.scanning.enableOnSearchPage);
-    $('#scan-delay').val(options.scanning.delay);
-    $('#scan-length').val(options.scanning.length);
-    $('#scan-modifier-key').val(options.scanning.modifier);
-    $('#popup-nesting-max-depth').val(options.scanning.popupNestingMaxDepth);
-
-    $('#dict-purge-link').click(utilAsync(onDictionaryPurge));
-    $('#dict-file').change(utilAsync(onDictionaryImport));
-
-    $('#anki-enable').prop('checked', options.anki.enable);
-    $('#card-tags').val(options.anki.tags.join(' '));
-    $('#sentence-detection-extent').val(options.anki.sentenceExt);
-    $('#interface-server').val(options.anki.server);
-    $('#screenshot-format').val(options.anki.screenshot.format);
-    $('#screenshot-quality').val(options.anki.screenshot.quality);
-    $('#field-templates').val(options.anki.fieldTemplates);
-    $('#field-templates-reset').click(utilAsync(onAnkiFieldTemplatesReset));
-    $('input, select, textarea').not('.anki-model').change(utilAsync(onFormOptionsChanged));
-    $('.anki-model').change(utilAsync(onAnkiModelChanged));
-
-    try {
-        await dictionaryGroupsPopulate(options);
-        await formMainDictionaryOptionsPopulate(options);
-    } catch (e) {
-        dictionaryErrorsShow([e]);
-    }
-
-    try {
-        await ankiDeckAndModelPopulate(options);
-    } catch (e) {
-        ankiErrorShow(e);
-    }
-
-    formUpdateVisibility(options);
+    formSetupEventListeners();
+    await formWrite(options);
 
     storageInfoInitialize();
+
+    chrome.runtime.onMessage.addListener(onMessage);
 }
 
 $(document).ready(utilAsync(onReady));
 
 
+/*
+ * Remote options updates
+ */
+
+function settingsGetSource() {
+    return new Promise((resolve) => {
+        chrome.tabs.getCurrent((tab) => resolve(`settings${tab ? tab.id : ''}`));
+    });
+}
+
+async function settingsSaveOptions() {
+    const source = await settingsGetSource();
+    await apiOptionsSave(source);
+}
+
+async function onOptionsUpdate({source}) {
+    const thisSource = await settingsGetSource();
+    if (source === thisSource) { return; }
+
+    const optionsContext = getOptionsContext();
+    const options = await apiOptionsGet(optionsContext);
+    await formWrite(options);
+}
+
+function onMessage({action, params}) {
+    if (action === 'optionsUpdate') {
+        onOptionsUpdate(params);
+    }
+}
+
+
 /*
  * Dictionary
  */
@@ -374,10 +424,11 @@ async function onDictionaryPurge(e) {
         dictionarySpinnerShow(true);
 
         await utilDatabasePurge();
-        const options = await optionsLoad();
+        const optionsContext = getOptionsContext();
+        const options = await apiOptionsGet(optionsContext);
         options.dictionaries = {};
         options.general.mainDictionary = '';
-        await optionsSave(options);
+        await settingsSaveOptions();
 
         await dictionaryGroupsPopulate(options);
         await formMainDictionaryOptionsPopulate(options);
@@ -414,8 +465,9 @@ async function onDictionaryImport(e) {
         setProgress(0.0);
 
         const exceptions = [];
-        const options = await optionsLoad();
         const summary = await utilDatabaseImport(e.target.files[0], updateProgress, exceptions);
+        const optionsContext = getOptionsContext();
+        const options = await apiOptionsGet(optionsContext);
         options.dictionaries[summary.title] = {enabled: true, priority: 0, allowSecondarySearches: false};
         if (summary.sequenced && options.general.mainDictionary === '') {
             options.general.mainDictionary = summary.title;
@@ -426,7 +478,7 @@ async function onDictionaryImport(e) {
             dictionaryErrorsShow(exceptions);
         }
 
-        await optionsSave(options);
+        await settingsSaveOptions();
 
         await dictionaryGroupsPopulate(options);
         await formMainDictionaryOptionsPopulate(options);
@@ -566,12 +618,14 @@ async function onAnkiModelChanged(e) {
         const tab = element.closest('.tab-pane');
         const tabId = tab.attr('id');
 
-        const {optionsNew, optionsOld} = await formRead();
-        optionsNew.anki[tabId].fields = {};
-        await optionsSave(optionsNew);
+        const optionsContext = getOptionsContext();
+        const options = await apiOptionsGet(optionsContext);
+        await formRead(options);
+        options.anki[tabId].fields = {};
+        await settingsSaveOptions();
 
         ankiSpinnerShow(true);
-        await ankiFieldsPopulate(element, optionsNew);
+        await ankiFieldsPopulate(element, options);
         ankiErrorShow();
     } catch (e) {
         ankiErrorShow(e);
@@ -583,9 +637,12 @@ async function onAnkiModelChanged(e) {
 async function onAnkiFieldTemplatesReset(e) {
     try {
         e.preventDefault();
-        const options = await optionsLoad();
-        $('#field-templates').val(options.anki.fieldTemplates = optionsFieldTemplates());
-        await optionsSave(options);
+        const optionsContext = getOptionsContext();
+        const options = await apiOptionsGet(optionsContext);
+        const fieldTemplates = optionsFieldTemplates();
+        options.anki.fieldTemplates = fieldTemplates;
+        $('#field-templates').val(fieldTemplates);
+        await settingsSaveOptions();
     } catch (e) {
         ankiErrorShow(e);
     }
diff --git a/ext/bg/js/translator.js b/ext/bg/js/translator.js
index c89b43ff..7b952622 100644
--- a/ext/bg/js/translator.js
+++ b/ext/bg/js/translator.js
@@ -36,8 +36,7 @@ class Translator {
         }
     }
 
-    async findTermsGrouped(text, dictionaries, alphanumeric) {
-        const options = await apiOptionsGet();
+    async findTermsGrouped(text, dictionaries, alphanumeric, options) {
         const titles = Object.keys(dictionaries);
         const {length, definitions} = await this.findTerms(text, dictionaries, alphanumeric);
 
@@ -55,8 +54,7 @@ class Translator {
         return {length, definitions: definitionsGrouped};
     }
 
-    async findTermsMerged(text, dictionaries, alphanumeric) {
-        const options = await apiOptionsGet();
+    async findTermsMerged(text, dictionaries, alphanumeric, options) {
         const secondarySearchTitles = Object.keys(options.dictionaries).filter(dict => options.dictionaries[dict].allowSecondarySearches);
         const titles = Object.keys(dictionaries);
         const {length, definitions} = await this.findTerms(text, dictionaries, alphanumeric);
diff --git a/ext/bg/js/util.js b/ext/bg/js/util.js
index 3dc7c900..79229229 100644
--- a/ext/bg/js/util.js
+++ b/ext/bg/js/util.js
@@ -104,3 +104,7 @@ function utilReadFile(file) {
         reader.readAsBinaryString(file);
     });
 }
+
+function utilIsObject(value) {
+    return typeof value === 'object' && value !== null && !Array.isArray(value);
+}
diff --git a/ext/bg/settings.html b/ext/bg/settings.html
index ddda8303..577e1a1f 100644
--- a/ext/bg/settings.html
+++ b/ext/bg/settings.html
@@ -70,6 +70,10 @@
             <div>
                 <h3>General Options</h3>
 
+                <div class="checkbox">
+                    <label><input type="checkbox" id="enable"> Enable content scanning</label>
+                </div>
+
                 <div class="checkbox">
                     <label><input type="checkbox" id="show-usage-guide"> Show usage guide on startup</label>
                 </div>
@@ -221,14 +225,6 @@
                     <label><input type="checkbox" id="auto-hide-results"> Automatically hide results</label>
                 </div>
 
-                <div class="checkbox options-advanced">
-                    <label><input type="checkbox" id="enable-scanning-of-popup-expressions"> Enable scanning of popup expressions</label>
-                </div>
-
-                <div class="checkbox">
-                    <label><input type="checkbox" id="enable-scanning-on-search-page"> Enable scanning on search page</label>
-                </div>
-
                 <div class="checkbox options-advanced">
                     <label><input type="checkbox" id="deep-dom-scan"> Deep DOM scan</label>
                 </div>
@@ -252,9 +248,26 @@
                         <option value="shift">Shift</option>
                     </select>
                 </div>
+            </div>
 
-                <div class="form-group options-advanced">
-                    <label for="popup-nesting-max-depth">Maximum nested popup depth</label>
+            <div id="popup-content-scanning">
+                <h3>Popup Content Scanning Options</h3>
+
+                <p class="help-block">
+                    Yomichan is able to create additional popups in order to scan the content of other popups.
+                    This feature can be enabled if the <strong>Maximum number of additional popups</strong> option is set to a value greater than 0.
+                </p>
+
+                <div class="checkbox">
+                    <label><input type="checkbox" id="enable-scanning-on-search-page"> Enable scanning on search page</label>
+                </div>
+
+                <div class="checkbox">
+                    <label><input type="checkbox" id="enable-scanning-of-popup-expressions"> Enable scanning of popup expressions</label>
+                </div>
+
+                <div class="form-group">
+                    <label for="popup-nesting-max-depth">Maximum number of additional popups</label>
                     <input type="number" min="0" id="popup-nesting-max-depth" class="form-control">
                 </div>
             </div>
diff --git a/ext/fg/js/api.js b/ext/fg/js/api.js
index aa3b2629..d0ac649a 100644
--- a/ext/fg/js/api.js
+++ b/ext/fg/js/api.js
@@ -17,24 +17,24 @@
  */
 
 
-function apiOptionsGet() {
-    return utilInvoke('optionsGet');
+function apiOptionsGet(optionsContext) {
+    return utilInvoke('optionsGet', {optionsContext});
 }
 
-function apiTermsFind(text) {
-    return utilInvoke('termsFind', {text});
+function apiTermsFind(text, optionsContext) {
+    return utilInvoke('termsFind', {text, optionsContext});
 }
 
-function apiKanjiFind(text) {
-    return utilInvoke('kanjiFind', {text});
+function apiKanjiFind(text, optionsContext) {
+    return utilInvoke('kanjiFind', {text, optionsContext});
 }
 
-function apiDefinitionAdd(definition, mode, context) {
-    return utilInvoke('definitionAdd', {definition, mode, context});
+function apiDefinitionAdd(definition, mode, context, optionsContext) {
+    return utilInvoke('definitionAdd', {definition, mode, context, optionsContext});
 }
 
-function apiDefinitionsAddable(definitions, modes) {
-    return utilInvoke('definitionsAddable', {definitions, modes}).catch(() => null);
+function apiDefinitionsAddable(definitions, modes, optionsContext) {
+    return utilInvoke('definitionsAddable', {definitions, modes, optionsContext}).catch(() => null);
 }
 
 function apiNoteView(noteId) {
diff --git a/ext/fg/js/float.js b/ext/fg/js/float.js
index 3c521714..348c114e 100644
--- a/ext/fg/js/float.js
+++ b/ext/fg/js/float.js
@@ -23,6 +23,10 @@ class DisplayFloat extends Display {
         this.autoPlayAudioTimer = null;
         this.styleNode = null;
 
+        this.optionsContext = {
+            depth: 0
+        };
+
         this.dependencies = Object.assign({}, this.dependencies, {docRangeFromPoint, docSentenceExtract});
 
         $(window).on('message', utilAsync(this.onMessage.bind(this)));
@@ -75,6 +79,7 @@ class DisplayFloat extends Display {
             },
 
             popupNestedInitialize: ({id, depth, parentFrameId}) => {
+                this.optionsContext.depth = depth;
                 popupNestedInitialize(id, depth, parentFrameId);
             }
         };
diff --git a/ext/fg/js/frontend.js b/ext/fg/js/frontend.js
index 52620933..0b60aa2b 100644
--- a/ext/fg/js/frontend.js
+++ b/ext/fg/js/frontend.js
@@ -28,6 +28,10 @@ class Frontend {
         this.options = null;
         this.ignoreNodes = (Array.isArray(ignoreNodes) && ignoreNodes.length > 0 ? ignoreNodes.join(',') : null);
 
+        this.optionsContext = {
+            depth: popup.depth
+        };
+
         this.primaryTouchIdentifier = null;
         this.contextMenuChecking = false;
         this.contextMenuPrevent = false;
@@ -40,9 +44,9 @@ class Frontend {
     static create() {
         const initializationData = window.frontendInitializationData;
         const isNested = (initializationData !== null && typeof initializationData === 'object');
-        const {id, parentFrameId, ignoreNodes} = isNested ? initializationData : {};
+        const {id, depth, parentFrameId, ignoreNodes} = isNested ? initializationData : {};
 
-        const popup = isNested ? new PopupProxy(id, parentFrameId) : PopupProxyHost.instance.createPopup(null);
+        const popup = isNested ? new PopupProxy(depth + 1, id, parentFrameId) : PopupProxyHost.instance.createPopup(null);
         const frontend = new Frontend(popup, ignoreNodes);
         frontend.prepare();
         return frontend;
@@ -50,7 +54,7 @@ class Frontend {
 
     async prepare() {
         try {
-            this.options = await apiOptionsGet();
+            this.options = await apiOptionsGet(this.optionsContext);
 
             window.addEventListener('message', this.onFrameMessage.bind(this));
             window.addEventListener('mousedown', this.onMouseDown.bind(this));
@@ -261,11 +265,8 @@ class Frontend {
 
     onBgMessage({action, params}, sender, callback) {
         const handlers = {
-            optionsSet: ({options}) => {
-                this.options = options;
-                if (!this.options.enable) {
-                    this.searchClear();
-                }
+            optionsUpdate: () => {
+                this.updateOptions();
             },
 
             popupSetVisible: ({visible}) => {
@@ -284,6 +285,13 @@ class Frontend {
         console.log(error);
     }
 
+    async updateOptions() {
+        this.options = await apiOptionsGet(this.optionsContext);
+        if (!this.options.enable) {
+            this.searchClear();
+        }
+    }
+
     popupTimerSet(callback) {
         this.popupTimerClear();
         this.popupTimer = window.setTimeout(callback, this.options.scanning.delay);
@@ -347,7 +355,7 @@ class Frontend {
             return;
         }
 
-        const {definitions, length} = await apiTermsFind(searchText);
+        const {definitions, length} = await apiTermsFind(searchText, this.optionsContext);
         if (definitions.length === 0) {
             return false;
         }
@@ -380,7 +388,7 @@ class Frontend {
             return;
         }
 
-        const definitions = await apiKanjiFind(searchText);
+        const definitions = await apiKanjiFind(searchText, this.optionsContext);
         if (definitions.length === 0) {
             return false;
         }
diff --git a/ext/fg/js/popup-nested.js b/ext/fg/js/popup-nested.js
index e0376bb2..de2acccc 100644
--- a/ext/fg/js/popup-nested.js
+++ b/ext/fg/js/popup-nested.js
@@ -25,7 +25,8 @@ async function popupNestedInitialize(id, depth, parentFrameId) {
     }
     popupNestedInitialized = true;
 
-    const options = await apiOptionsGet();
+    const optionsContext = {depth};
+    const options = await apiOptionsGet(optionsContext);
     const popupNestingMaxDepth = options.scanning.popupNestingMaxDepth;
 
     if (!(typeof popupNestingMaxDepth === 'number' && typeof depth === 'number' && depth < popupNestingMaxDepth)) {
diff --git a/ext/fg/js/popup-proxy.js b/ext/fg/js/popup-proxy.js
index f6295079..56e710eb 100644
--- a/ext/fg/js/popup-proxy.js
+++ b/ext/fg/js/popup-proxy.js
@@ -18,14 +18,14 @@
 
 
 class PopupProxy {
-    constructor(parentId, parentFrameId) {
+    constructor(depth, parentId, parentFrameId) {
         this.parentId = parentId;
         this.parentFrameId = parentFrameId;
         this.id = null;
         this.idPromise = null;
         this.parent = null;
         this.child = null;
-        this.depth = 0;
+        this.depth = depth;
 
         this.container = null;
 
diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index ebf56897..eca67b5e 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -27,6 +27,7 @@ class Display {
         this.sequence = 0;
         this.index = 0;
         this.audioCache = {};
+        this.optionsContext = {};
 
         this.dependencies = {};
 
@@ -66,7 +67,7 @@ class Display {
                 context.source.source = this.context.source;
             }
 
-            const kanjiDefs = await apiKanjiFind(link.text());
+            const kanjiDefs = await apiKanjiFind(link.text(), this.optionsContext);
             this.kanjiShow(kanjiDefs, this.options, context);
         } catch (e) {
             this.onError(e);
@@ -89,7 +90,7 @@ class Display {
             try {
                 textSource.setEndOffset(this.options.scanning.length);
 
-                ({definitions, length} = await apiTermsFind(textSource.text()));
+                ({definitions, length} = await apiTermsFind(textSource.text(), this.optionsContext));
                 if (definitions.length === 0) {
                     return false;
                 }
@@ -379,7 +380,7 @@ class Display {
 
     async adderButtonUpdate(modes, sequence) {
         try {
-            const states = await apiDefinitionsAddable(this.definitions, modes);
+            const states = await apiDefinitionsAddable(this.definitions, modes, this.optionsContext);
             if (!states || sequence !== this.sequence) {
                 return;
             }
@@ -453,7 +454,7 @@ class Display {
                 }
             }
 
-            const noteId = await apiDefinitionAdd(definition, mode, context);
+            const noteId = await apiDefinitionAdd(definition, mode, context, this.optionsContext);
             if (noteId) {
                 const index = this.definitions.indexOf(definition);
                 Display.adderButtonFind(index, mode).addClass('disabled');