Really nice plugin . i really should read those python & ruby books i was able to launch tear twice from the same terminal fine. i think your problem is that you are launching from dbus and dbus only lets you launch a program once.
I'm not saving the favicons yet since the april WebKit didn't have a way to get them (and the current one maybe doesn't ), but external retrieval will be possible anyway. They will go in the sqlite3 db too as blobs.