Found this up in my Fx error console. This is related to Activity ObserverTest 1.1.
I just installed the https://bugzilla.mozilla.org/show_bug.cgi?id=514327 fix in my 3.7a1 pre version that did not have this Firefox.js file in the profile folder, now I guess it is working just fine,because it was a onetime Test extension, so there was no update naturally.
luntrusWarning: RDFItemUpdater:_parseV20UpdateInfo: No updates were found for:
activityobserver@janodvarko.cz
If you are an Extension developer and were expecting there to be
updates, this could mean any number of things, since the RDF system
doesn't give up much in the way of information when the load fails.
Try checking that:
1. Your RDF File is correct - e.g. check that there is a top level
RDF Resource with a URI urn:mozilla:extension:{GUID}, and that
the <em:updates> listed all have matching GUIDs.