I have similar issues with both Firefox 25.0.1 and Thunderbird 24.1.1. I have multiple extensions installed on both, but neither has a single same extension (so either this may be caused by multiple different extensions or something else is going on).
Additional info: - I have been hit with this problem every now and then since around Firefox 10 and Thunderbird 3. I think this is a problem in Ubuntu XUL core because the problem is visible with both Firefox and Thunderbird. - I have been hit with this problem using at least Gnome 2.x, Unity and Cinnamon desktop environments so I'd guess this is not related to the window manager. I haven't used KDE long enough to verify if this problem is visible in that environment, too. - Since I have reduced the system latency(*) I've hit this problem more often; I guess it's some kind of race condition between some paraller threads or processes doing something. The system is running on i7-3770k with HT enabled (without overclocking). (*) mira@desktop:/proc/sys/kernel# grep . sched_* ... sched_latency_ns:200000 sched_migration_cost_ns:500000 sched_min_granularity_ns:100000 sched_nr_migrate:3 sched_wakeup_granularity_ns:50000 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1231588 Title: Firefox windows don't accept focus To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1231588/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
