Added Safari Support

chrome/common.js

+(function() {
+  /* Events */
+
+  WrappedEventTarget = function(target) {
+    this._listeners = [];
+    this._wrappedListeners = [];
+    this._target = target;
+  };
+  WrappedEventTarget.prototype = {
+    _prepareExtraArguments: function() {
+      return [];
+    },
+    addListener: function(listener) {
+      var extaArgs = Array.prototype.slice.call(arguments, 1);
+      extaArgs = this._prepareExtraArguments.apply(this, extaArgs);
+
+      var wrappedListener = this._wrapListener(listener);
+      this._listeners.push(listener);
+      this._wrappedListeners.push(wrappedListener);
+
+      this._target.addListener.apply(this._target, [wrappedListener].concat(extaArgs));
+    },
+    removeListener: function(listener) {
+      var idx = this._listeners.indexOf(listener);
+
+      if (idx != -1) {
+        this._target.removeListener(this._wrappedListeners[idx]);
+
+        this._listeners.splice(idx, 1);
+        this._wrappedListeners.splice(idx, 1);
+      }
+    }
+  };
+
+  var MessageEventTarget = function() {
+    WrappedEventTarget.call(this, chrome.runtime.onMessage);
+  };
+  MessageEventTarget.prototype = {
+    __proto__: WrappedEventTarget.prototype,
+    _wrapListener: function(listener) {
+      return function(message, sender, sendResponse) {
+        listener(message, {tab: sender.tab && new Tab(sender.tab)}, sendResponse);
+      };
+    }
+  };
+
+  /* API */
+
+  ext = {
+    backgroundPage: {
+      sendMessage: function(message, responseCallback) {
+        chrome.runtime.sendMessage(message, responseCallback);
+      },
+      getDOMWindow: function() {
+        return chrome.extension.getBackgroundPage();
+      }
+    },
+    getURL: chrome.extension.getURL,
+    onMessage: new MessageEventTarget(),
+    i18n: chrome.i18n
+  };
+})();