Rated 2 out of 5 stars
i ran into the same problem as a previous reviewed -- a total lockup of FF3. It must be an extension conflict.
if you have this trouble, there is an easy fix -- use FF3's safe mode to load your profile, then simply go to add-ons and disable Tab Kit. (you can go ahead and re-enable TPM while you're there.) then restart, and all is well.
if anyone else has this trouble and is able to identify the conflicting extension(s), please post here. i'll try to find it myself, but this is a time-consuming project.
looks like Tab Kit is worth the trouble, but it is trouble to find a conflict, and terrible trouble to lockup FF3.