diff --git a/ext/bg/js/options-form.js b/ext/bg/js/options-form.js
index 93755745..496fc91c 100644
--- a/ext/bg/js/options-form.js
+++ b/ext/bg/js/options-form.js
@@ -49,19 +49,19 @@ function updateAnkiFormData() {
 
     const ankiDeck = $('#ankiDeck');
     ankiDeck.find('option').remove();
-    yomichan.api_getDeckNames((names) => {
+    yomichan.api_getDeckNames({callback: (names) => {
         if (names !== null) {
             names.forEach((name) => ankiDeck.append($('<option/>', {value: name, text: name})));
         }
-    });
+    }});
 
     const ankiModel = $('#ankiModel');
     ankiModel.find('option').remove();
-    yomichan.api_getModelNames((names) => {
+    yomichan.api_getModelNames({callback: (names) => {
         if (names !== null) {
             names.forEach((name) => ankiModel.append($('<option/>', {value: name, text: name})));
         }
-    });
+    }});
 }
 
 function onOptionsChanged() {
diff --git a/ext/bg/js/yomichan.js b/ext/bg/js/yomichan.js
index bceaa6ca..0187f76f 100644
--- a/ext/bg/js/yomichan.js
+++ b/ext/bg/js/yomichan.js
@@ -50,11 +50,11 @@ class Yomichan {
     }
 
     onMessage(request, sender, callback) {
-        const {action, params} = request;
-        const method           = this['api_' + action];
+        const {action, params} = request, method = this['api_' + action];
 
         if (typeof(method) === 'function') {
-            method.call(this, callback, params);
+            params.callback = callback;
+            method.call(this, params);
         }
 
         return true;
@@ -132,39 +132,39 @@ class Yomichan {
         });
     }
 
-    api_addNote(callback, {definition, mode}) {
+    api_addNote({definition, mode, callback}) {
         this.ankiInvoke('addNote', {definition: definition, mode: mode}, null, callback);
     }
 
-    api_canAddNotes(callback, {definitions, modes}) {
+    api_canAddNotes({definitions, modes, callback}) {
         this.ankiInvoke('canAddNotes', {definitions: definitions, modes: modes}, 'notes', callback);
     }
 
-    api_findKanji(callback, text) {
+    api_findKanji({text, callback}) {
         callback(this.translator.findKanji(text));
     }
 
-    api_findTerm(callback, text) {
+    api_findTerm({text, callback}) {
         callback(this.translator.findTerm(text));
     }
 
-    api_getDeckNames(callback) {
+    api_getDeckNames({callback}) {
         this.ankiInvoke('deckNames', {}, null, callback);
     }
 
-    api_getModelNames(callback) {
+    api_getModelNames({callback}) {
         this.ankiInvoke('modelNames', {}, null, callback);
     }
 
-    api_getOptions(callback) {
+    api_getOptions({callback}) {
         callback(this.options);
     }
 
-    api_getState(callback) {
+    api_getState({callback}) {
         callback(this.state);
     }
 
-    api_renderText(callback, {template, data}) {
+    api_renderText({template, data, callback}) {
         callback(Handlebars.templates[template](data));
     }
 }
diff --git a/ext/fg/js/api.js b/ext/fg/js/api.js
index 05db4618..462eafd1 100644
--- a/ext/fg/js/api.js
+++ b/ext/fg/js/api.js
@@ -22,27 +22,27 @@
 //
 
 function bgSendMessage(action, params, callback) {
-    chrome.runtime.sendMessage({action: action, params: params}, callback);
+    chrome.runtime.sendMessage({action, params}, callback);
 }
 
 function bgFindTerm(text, callback) {
-    bgSendMessage('findTerm', text, callback);
+    bgSendMessage('findTerm', {text}, callback);
 }
 
 function bgFindKanji(text, callback) {
-    bgSendMessage('findKanji', text, callback);
+    bgSendMessage('findKanji', {text}, callback);
 }
 
 function bgRenderText(data, template, callback) {
-    bgSendMessage('renderText', {data: data, template: template}, callback);
+    bgSendMessage('renderText', {data, template}, callback);
 }
 
 function bgGetOptions(callback) {
-    bgSendMessage('getOptions', null, callback);
+    bgSendMessage('getOptions', {}, callback);
 }
 
 function bgGetState(callback) {
-    bgSendMessage('getState', null, callback);
+    bgSendMessage('getState', {}, callback);
 }
 
 function bgCanAddNotes(definitions, modes, callback) {
@@ -50,5 +50,5 @@ function bgCanAddNotes(definitions, modes, callback) {
 }
 
 function bgAddNote(definition, mode, callback) {
-    bgSendMessage('addNote', {definition: definition, mode: mode}, callback);
+    bgSendMessage('addNote', {definition, mode}, callback);
 }
diff --git a/ext/fg/js/client.js b/ext/fg/js/client.js
index 5878a5c6..bb25c4e4 100644
--- a/ext/fg/js/client.js
+++ b/ext/fg/js/client.js
@@ -80,13 +80,9 @@ class Client {
     }
 
     onFrameMessage(e) {
-        const {action, params} = e.data, handlers = {
-            addNote:      ({mode, index}) => this.actionAddNote(index, mode, (data) => e.source.postMessage(data, e.origin)),
-            displayKanji: this.actionDisplayKanji
-        };
-
-        if (handlers.hasOwnProperty(action)) {
-            handlers[action].call(this, params);
+        const {action, params} = e.data, method = this['api_' + action];
+        if (typeof(method) === 'function') {
+            method.call(this, params);
         }
     }
 
@@ -126,40 +122,6 @@ class Client {
         });
     }
 
-    actionAddNote(index, mode, callback) {
-        const state = {};
-        state[mode] = false;
-
-        bgAddNote(this.definitions[index], mode, (success) => {
-            if (success) {
-                this.popup.sendMessage('setActionState', {index: index, state: state, sequence: this.sequence});
-            } else {
-                alert('Note could not be added');
-            }
-        });
-
-    }
-
-    actionDisplayKanji(kanji) {
-        bgFindKanji(kanji, (definitions) => {
-            const sequence = ++this.sequence;
-            bgRenderText(
-                {defs: definitions, root: this.fgRoot, options: this.options, sequence: sequence},
-                'kanji-list.html',
-                (content) => {
-                    this.definitions = definitions;
-                    this.popup.setContent(content, definitions);
-
-                    bgCanAddNotes(definitions, ['kanji'], (states) => {
-                        if (states !== null) {
-                            states.forEach((state, index) => this.popup.sendMessage('setActionState', {index: index, state: state, sequence: sequence}));
-                        }
-                    });
-                }
-            );
-        });
-    }
-
     showPopup(range, content) {
         this.popup.showNextTo(range.getRect(), content);
 
@@ -190,6 +152,39 @@ class Client {
     setOptions(opts) {
         this.options = opts;
     }
+
+    api_addNote({index, mode}) {
+        const state = {};
+        state[mode] = false;
+
+        bgAddNote(this.definitions[index], mode, (success) => {
+            if (success) {
+                this.popup.sendMessage('setActionState', {index: index, state: state, sequence: this.sequence});
+            } else {
+                alert('Note could not be added');
+            }
+        });
+    }
+
+    api_displayKanji(kanji) {
+        bgFindKanji(kanji, (definitions) => {
+            const sequence = ++this.sequence;
+            bgRenderText(
+                {defs: definitions, root: this.fgRoot, options: this.options, sequence: sequence},
+                'kanji-list.html',
+                (content) => {
+                    this.definitions = definitions;
+                    this.popup.setContent(content, definitions);
+
+                    bgCanAddNotes(definitions, ['kanji'], (states) => {
+                        if (states !== null) {
+                            states.forEach((state, index) => this.popup.sendMessage('setActionState', {index: index, state: state, sequence: sequence}));
+                        }
+                    });
+                }
+            );
+        });
+    }
 }
 
 window.yomiClient = new Client();