Index: lib/compat.js
diff --git a/lib/compat.js b/lib/compat.js
index d544edca8faa300d5ff3833b0470131b43d7b4a6..21439f3d353d904341f2b54ac7fe7f14190ac3bd 100644
--- a/lib/compat.js
+++ b/lib/compat.js
@@ -15,6 +15,8 @@
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+"use strict";
+
 //
 // Module framework stuff
 //
@@ -33,28 +35,28 @@ require.scopes = Object.create(null);
 
 function importAll(module, globalObj)
 {
-  var exports = require(module);
-  for (var key in exports)
+  let exports = require(module);
+  for (let key in exports)
     globalObj[key] = exports[key];
 }
 
-onShutdown = {
+let onShutdown = {
   done: false,
-  add: function() {},
-  remove: function() {}
+  add() {},
+  remove() {}
 };
 
 //
 // XPCOM emulation
 //
 
-var Components =
+let Components =
 {
   interfaces:
   {
     nsIFile: {DIRECTORY_TYPE: 0},
-    nsIFileURL: function() {},
-    nsIHttpChannel: function() {},
+    nsIFileURL() {},
+    nsIHttpChannel() {},
     nsITimer: {TYPE_REPEATING_SLACK: 0},
     nsIInterfaceRequestor: null,
     nsIChannelEventSink: null
@@ -63,44 +65,35 @@ var Components =
   {
     "@mozilla.org/timer;1":
     {
-      createInstance: function()
-      {
-        return new FakeTimer();
-      }
+      createInstance() { return new FakeTimer(); }
     },
     "@mozilla.org/xmlextras/xmlhttprequest;1":
     {
-      createInstance: function()
-      {
-        return new XMLHttpRequest();
-      }
+      createInstance() { return new XMLHttpRequest(); }
     }
   },
   results: {},
   utils: {
-    import: function()
+    import()
     {
     },
-    reportError: function(e)
+    reportError(e)
     {
       console.error(e);
       console.trace();
     }
   },
   manager: null,
-  ID: function()
-  {
-    return null;
-  }
+  ID() { return null; }
 };
 const Cc = Components.classes;
 const Ci = Components.interfaces;
 const Cr = Components.results;
 const Cu = Components.utils;
 
-var XPCOMUtils =
+let XPCOMUtils =
 {
-  generateQI: function() {}
+  generateQI() {}
 };
 
 //
@@ -121,40 +114,40 @@ FakeFile.prototype =
   {
     this.path = value;
   },
-  append: function(path)
+  append(path)
   {
     this.path += path;
   },
-  clone: function()
+  clone()
   {
     return new FakeFile(this.path);
   },
   get parent()
   {
-    return {create: function() {}};
+    return {create() {}};
   },
-  normalize: function() {}
+  normalize() {}
 };
 
 //
 // Services.jsm module emulation
 //
 
-var Services =
+let Services =
 {
   obs: {
-    addObserver: function() {},
-    removeObserver: function() {}
+    addObserver() {},
+    removeObserver() {}
   },
   vc: {
-    compare: function(v1, v2)
+    compare(v1, v2)
     {
       function parsePart(s)
       {
         if (!s)
           return parsePart("0");
 
-        var part = {
+        let part = {
           numA: 0,
           strB: "",
           numC: 0,
@@ -167,7 +160,7 @@ var Services =
           return part;
         }
 
-        var matches = s.match(/(\d*)(\D*)(\d*)(.*)/);
+        let matches = s.match(/(\d*)(\D*)(\d*)(.*)/);
         part.numA = parseInt(matches[1], 10) || part.numA;
         part.strB = matches[2] || part.strB;
         part.numC = parseInt(matches[3], 10) || part.numC;
@@ -193,9 +186,9 @@ var Services =
 
       function compareParts(p1, p2)
       {
-        var result = 0;
-        var elements = ["numA", "strB", "numC", "extraD"];
-        elements.some(function(element)
+        let result = 0;
+        let elements = ["numA", "strB", "numC", "extraD"];
+        elements.some(element =>
         {
           result = comparePartElement(p1[element], p2[element]);
           return result;
@@ -203,11 +196,11 @@ var Services =
         return result;
       }
 
-      var parts1 = v1.split(".");
-      var parts2 = v2.split(".");
-      for (var i = 0; i < Math.max(parts1.length, parts2.length); i++)
+      let parts1 = v1.split(".");
+      let parts2 = v2.split(".");
+      for (let i = 0; i < Math.max(parts1.length, parts2.length); i++)
       {
-        var result = compareParts(parsePart(parts1[i]), parsePart(parts2[i]));
+        let result = compareParts(parsePart(parts1[i]), parsePart(parts2[i]));
         if (result)
           return result;
       }
@@ -220,7 +213,7 @@ var Services =
 // FileUtils.jsm module emulation
 //
 
-var FileUtils =
+let FileUtils =
 {
   PERMS_DIRECTORY: 0
 };
@@ -232,26 +225,25 @@ FakeTimer.prototype =
 {
   delay: 0,
   callback: null,
-  initWithCallback: function(callback, delay)
+  initWithCallback(callback, delay)
   {
     this.callback = callback;
     this.delay = delay;
     this.scheduleTimeout();
   },
-  scheduleTimeout: function()
+  scheduleTimeout()
   {
-    var me = this;
-    window.setTimeout(function()
+    window.setTimeout(() =>
     {
       try
       {
-        me.callback();
+        this.callback();
       }
       catch(e)
       {
         Cu.reportError(e);
       }
-      me.scheduleTimeout();
+      this.scheduleTimeout();
     }, this.delay);
   }
 };
@@ -267,7 +259,7 @@ XMLHttpRequest.prototype.channel =
   loadFlags: 0,
   INHIBIT_CACHING: 0,
   VALIDATE_ALWAYS: 0,
-  QueryInterface: function()
+  QueryInterface()
   {
     return this;
   }