Index: gc_lang/fr/webext/content_scripts/init.js
==================================================================
--- gc_lang/fr/webext/content_scripts/init.js
+++ gc_lang/fr/webext/content_scripts/init.js
@@ -62,13 +62,13 @@
     oOptions: null,
 
     listenRightClick: function () {
         // Node where a right click is done
         // Bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=1325814
-        document.addEventListener('contextmenu', function (xEvent) {
+        document.addEventListener('contextmenu', (xEvent) => {
             this.xRightClickedNode = xEvent.target;
-        }.bind(this), true);
+        }, true);
     },
 
     clearRightClickedNode: function () {
         this.xRightClickedNode = null;
     },

Index: gc_lang/fr/webext/content_scripts/panel.js
==================================================================
--- gc_lang/fr/webext/content_scripts/panel.js
+++ gc_lang/fr/webext/content_scripts/panel.js
@@ -71,30 +71,28 @@
         return xButtonLine;
     }
 
     _createWaitIcon () {
         let xWaitIcon = oGrammalecte.createNode("div", {className: "grammalecte_spinner"});
-        //xWaitIcon.appendChild(oGrammalecte.createNode("div", {className: "bounce1"}));
-        //xWaitIcon.appendChild(oGrammalecte.createNode("div", {className: "bounce2"}));
         return xWaitIcon;
     }
 
     _createCopyButton () {
         let xButton = oGrammalecte.createNode("div", {id: "grammalecte_clipboard_button", className: "grammalecte_panel_button grammalecte_copy_button", textContent: "∑", title: "Copier dans le presse-papiers"});
-        xButton.onclick = function () { this.copyTextToClipboard(); }.bind(this);
+        xButton.onclick = () => { this.copyTextToClipboard(); };
         return xButton;
     }
 
     _createMoveButton (sAction, sLabel, sTitle) {
         let xButton = oGrammalecte.createNode("div", {className: "grammalecte_panel_button grammalecte_move_button", textContent: sLabel, title: sTitle});
-        xButton.onclick = function () { this[sAction](); }.bind(this);
+        xButton.onclick = () => { this[sAction](); };
         return xButton;
     }
 
     _createCloseButton () {
         let xButton = oGrammalecte.createNode("div", {className: "grammalecte_panel_button grammalecte_close_button", textContent: "×", title: "Fermer la fenêtre"});
-        xButton.onclick = function () { this.hide(); }.bind(this);  // better than writing “let that = this;” before the function?
+        xButton.onclick = () => { this.hide(); };
         return xButton;
     }
 
     insertIntoPage () {
         if (this.bShadow) {