Just to confirm what jdstrand has already said disabling Add-ons and running in safe mode makes no difference. I had to follow his advice regarding 'ui.use_unity_menubar = false' in order to stop this behaviour and gain back some battery life as a laptop with a browser that uses 100% CPU every few seconds doesn't last long.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/968533 Title: Alt-tab to Firefox sends Firefox to 100% CPU; unity-panel-service to 80% CPU and hud-service to 20-80% CPU To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/968533/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs