Thank you Rated 4 out of 5 stars

Please, check multiple rows then tab bar at the bottom. Then tab bar at the bottom, only one row is showing.
I have tested in Fx 10 with clear profile.

This review is for a previous version of the add-on (0.9.9.2.1-signed). 

Thanks for reporting

Could you also create an issue on Google Code so that people (including me) can track it?