Given that this is memory usage-related and browsers are well known to consume quite a bit of it especially with large numbers of tabs, I'd echo Daniel's suggestion (glad to hear it helped here!), and will close this as 'wontfix' since it's highly unlikely to be 'fixable'/improvable overnight with a single change. Thanks.
** Changed in: firefox (Ubuntu) Status: New => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2033197 Title: ubuntu (perhaps its the gnome desktop) freezes every few seconds saying wait or force quit window then unfreezes, this still happens after reboot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2033197/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs