http://forums.mozillazine.org/viewtopic.php?p=14860716#p14860716

– for a session that should have had 16 (sixteen) tabs, only 8 (eight) existed.

http://forums.mozillazine.org/viewtopic.php?f=48&t=3044441&p=14860399#p14860399

– the preference to use a tab (not a pop-up) for the interface is not respected.