5 files changed, 11 insertions, 13 deletions
diff --git a/ext/fg/js/client.js b/ext/fg/js/client.js
index 1bd68aea..628d5b30 100644
--- a/ext/fg/js/client.js
+++ b/ext/fg/js/client.js
@@ -158,9 +158,7 @@ class Client {
     }
 
     api_addNote({index, mode}) {
-        const state = {};
-        state[mode] = false;
-
+        const state = {[mode]: false};
         bgAddDefinition(this.definitions[index], mode).then((success) => {
             if (success) {
                 this.popup.sendMessage('setActionState', {index, state, sequence: this.sequence});
diff --git a/ext/fg/js/frame.js b/ext/fg/js/frame.js
index 165a9795..8f3d3877 100644
--- a/ext/fg/js/frame.js
+++ b/ext/fg/js/frame.js
@@ -18,7 +18,7 @@
 
 
 function registerKanjiLinks() {
-    for (let link of [].slice.call(document.getElementsByClassName('kanji-link'))) {
+    for (const link of Array.from(document.getElementsByClassName('kanji-link'))) {
         link.addEventListener('click', (e) => {
             e.preventDefault();
             window.parent.postMessage({action: 'displayKanji', params: e.target.innerHTML}, '*');
@@ -27,7 +27,7 @@ function registerKanjiLinks() {
 }
 
 function registerAddNoteLinks() {
-    for (let link of [].slice.call(document.getElementsByClassName('action-add-note'))) {
+    for (const link of Array.from(document.getElementsByClassName('action-add-note'))) {
         link.addEventListener('click', (e) => {
             e.preventDefault();
             const ds = e.currentTarget.dataset;
@@ -37,7 +37,7 @@ function registerAddNoteLinks() {
 }
 
 function registerAudioLinks() {
-    for (let link of [].slice.call(document.getElementsByClassName('action-play-audio'))) {
+    for (const link of Array.from(document.getElementsByClassName('action-play-audio'))) {
         link.addEventListener('click', (e) => {
             e.preventDefault();
             const ds = e.currentTarget.dataset;
@@ -60,7 +60,7 @@ function onMessage(e) {
 }
 
 function api_setActionState({index, state, sequence}) {
-    for (let mode in state) {
+    for (const mode in state) {
         const matches = document.querySelectorAll(`.action-bar[data-sequence="${sequence}"] .action-add-note[data-index="${index}"][data-mode="${mode}"]`);
         if (matches.length === 0) {
             return;
diff --git a/ext/fg/js/popup.js b/ext/fg/js/popup.js
index 78106319..a0eb725c 100644
--- a/ext/fg/js/popup.js
+++ b/ext/fg/js/popup.js
@@ -19,15 +19,15 @@
 
 class Popup {
     constructor() {
-        this.popup  = null;
+        this.popup = null;
         this.offset = 10;
     }
 
     showAt(pos, content) {
         this.inject();
 
-        this.popup.style.left       = pos.x + 'px';
-        this.popup.style.top        = pos.y + 'px';
+        this.popup.style.left = pos.x + 'px';
+        this.popup.style.top = pos.y + 'px';
         this.popup.style.visibility = 'visible';
 
         this.setContent(content);
diff --git a/ext/fg/js/source-element.js b/ext/fg/js/source-element.js
index 3110ed53..d3cc42a1 100644
--- a/ext/fg/js/source-element.js
+++ b/ext/fg/js/source-element.js
@@ -71,6 +71,6 @@ class TextSourceElement {
     }
 
     equals(other) {
-        return other.element && other.textRaw() == this.textRaw();
+        return other.element && other.textRaw() === this.textRaw();
     }
 }
diff --git a/ext/fg/js/source-range.js b/ext/fg/js/source-range.js
index a25b3fdc..6d445f54 100644
--- a/ext/fg/js/source-range.js
+++ b/ext/fg/js/source-range.js
@@ -81,7 +81,7 @@ class TextSourceRange {
     }
 
     static seekForward(node, length) {
-        const state = {node, offset: 0, length};
+        const state = {node, length, offset: 0};
         if (!TextSourceRange.seekForwardHelper(node, state)) {
             return state;
         }
@@ -115,7 +115,7 @@ class TextSourceRange {
     }
 
     static seekBackward(node, length) {
-        const state = {node, offset: node.length, length};
+        const state = {node, length, offset: node.length};
         if (!TextSourceRange.seekBackwardHelper(node, state)) {
             return state;
         }