I found the problem, however it was not directly a firefox problem. There was a problem with d-bus messages, which also slowed down many other applications. After removing .dbus, .pulse and .pulse-cookie directory from $HOME, the issue vansihed.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/879240 Title: Firefox hangs when trying to use any dropdown or right-click menu To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/879240/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
