Doesn't work any more Rated 1 out of 5 stars

Very nice add-on, but unfortunately it doesn't work any more with the actual FF versions. It seems that the author stopped updating this add-on. Very sad. :(

Followup: It seems I can't answer directly to the developers response. So I'm doing it here:

Yes, it works a little bit with FF 19. But there's a big issue: Suddenly TabGroup Menu "forgets" names of the tab groups. It renames it to "(Anonymous: xyz)", or some tab groups are simply disappearing. This appears very often.

This review is for a previous version of the add-on ( 

I'm using FF 19 and it still works.