This isn't necessarily Ubuntu specific -- after having it happen more than once on update from Update Manager, I had it happen when I installed an extension manually, and was told to restart.
The gravity of this simple issue is astounding -- I just lot about 40+ tabs. -- Firefox does not restore session after update https://bugs.launchpad.net/bugs/309656 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