According to a poster on the Tab Mix Plus forums, and confirmed on my system, the problem is a conflict between the "Ubuntu Firefox Modifications" extension and TMP. Since my life depends on TMP, I disabled the Ubuntu extension, and customization works again.
-- [Intrepid] Unable to customize Firefox toolbars https://bugs.launchpad.net/bugs/275408 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
