After trying many different conditions, it seems that it depends on the number of bookmarks. I have more than 2000 bookmarks. If I delete them, firefox doesn't hang.
Note also this happens without any add-ons (but the Ubuntu ones). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/964584 Title: Firefox hangs temporarily everytimes it receives the focus To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/964584/+subscriptions -- ubuntu-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs