Ok, here there seems to be a conflict between Ubuntu Firefox Modifications and Tab Mix Plus. If I disable any of them, all buttons reappear.
-- Firefox only shows default icons in toolbars https://bugs.launchpad.net/bugs/281348 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
