Found the problem! Seems like a change of behaviour makes one of our settings behave differently than before:
1. Open about:config 2. Change dom.indexedDB.enabled to true (which is default, but in my case it was set to false) 3. Restart the browser This finally works. My open tabs from before are even restored! For more details, see http://www.ghacks.net/2015/01/16/fix-add-ons-not- working-in-firefox-35/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1411290 Title: Firefox 35 does not restore previous session / tabs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1411290/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs