diff -r 000000000000 -r 6474c204b198 browser/base/content/test/social/browser_defaults.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/social/browser_defaults.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+
+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);
+  }
+}