Firefox: implement toolbar button and popup

platform/chromium/vapi-client.js

@@ -87,7 +87,7 @@ var messagingConnector = function(response) {
 /******************************************************************************/
 
 var uniqueId = function() {
-    return parseInt(Math.random() * 1e10, 10).toString(36);
+    return Math.random().toString(36).slice(2);
 };
 
 /******************************************************************************/