The Tor Browser / file revision

 let SocialService = Cu.import("resource://gre/modules/SocialService.jsm", {}).SocialService;

 // this test ensures that any builtin providers have the builtin flag that we

 // need to help with "install" of a builtin.

 function test() {

   let manifestPrefs = Services.prefs.getDefaultBranch("social.manifest.");

   let prefs = manifestPrefs.getChildList("", []);

   ok(prefs.length > 0, "we have builtin providers");

   for (let pref of prefs) {

     let manifest = JSON.parse(manifestPrefs.getComplexValue(pref, Ci.nsISupportsString).data);

     ok(manifest.builtin, "manifest is builtin " + manifest.origin);

   }

 }