Rated 4 out of 5 stars

per Hb el mar. 3, 2012 · enllaç permanent

Works under Seamonkey 2, too!
Needed to add the targetApplication in install.rdf [1] and to set extensions.thunderbox.boxen.0.addressbookURI = "moz-abmdbdirectory://abook.mab" [2].

[1] http://forums.mozillazine.org/viewtopic.php?f=19&t=500361&start=1710#p11382371
[2] about:config