Firefox,Safari: fill vAPI.app in a different way

Pass the extension data (name and version) as the fragment of the URL
for the background script, so vAPI.app can be filled without using XHR
to read the manifest files.

platform/firefox/vapi-background.js

@@ -43,9 +43,10 @@ vAPI.firefox = true;
 
 /******************************************************************************/
 
+vAPI.app = location.hash.slice(1).split(',');
 vAPI.app = {
-    name: 'µBlock',
-    version: '0.8.2.0'
+    name: vAPI.app[0],
+    version: vAPI.app[1]
 };
 
 /******************************************************************************/