Issue 2259 - Removed non-standard JavaScript code from Element Hiding Helper

lib/aardvark.js

Index: lib/aardvark.js
===================================================================
--- a/lib/aardvark.js
+++ b/lib/aardvark.js
@@ -7,7 +7,7 @@
 let {Prefs} = require("prefs");
 
 // Make sure to stop selection when we are uninstalled
-onShutdown.add(function() Aardvark.quit());
+onShutdown.add(() => Aardvark.quit());
 
 // To be replaced when selection starts
 function E(id) {return null;}
@@ -60,7 +60,7 @@
 
     this.window = wrapper.window;
     this.browser = wrapper.browser;
-    E = function(id) wrapper.E(id);
+    E = id => wrapper.E(id);
 
     this.browser.addEventListener("click", this.onMouseClick, true);
     this.browser.addEventListener("DOMMouseScroll", this.onMouseScroll, true);
@@ -563,7 +563,7 @@
     this.commentElem = null;
     this.lockedAnchor = null;
     this.boxElem = null;
-    E = function(id) null;
+    E = id => null;
     return false;
   },
 
@@ -752,5 +752,5 @@
 
 // Makes sure event handlers like Aardvark.onKeyPress always have the correct
 // this pointer set.
-for each (let method in ["onMouseClick", "onMouseScroll", "onKeyPress", "onPageHide", "onMouseMove", "onAfterPaint", "quit"])
+for (let method of ["onMouseClick", "onMouseScroll", "onKeyPress", "onPageHide", "onMouseMove", "onAfterPaint", "quit"])
   Aardvark[method] = Aardvark[method].bind(Aardvark);