Tabbrowser works with Mozilla, not working with firefox

[Grzegorz Wyszyński <gresioo@monitorek.eu.org>]

I have installed mozilla and mozilla-firefox from official packages from 
 official debian respository. My system is sid. I have polish locales 
both on mozilla and mozilla-firefox. On mozilla Tabbrowser extensions 
plugin works both on typical user account and root, but on firefox it 
works only with root account. On normal it is shown in list of 
extensions, I can change options, but it doesn't add menu item and 
doesn't do anything else. This extension is from official respository 
too. I would be very grateful if somebody could help me.
--
Grzegorz 'gresioo' Wyszyński