Can anyone still reproduce this with Firefox 13. If so, on what version/s of Ubuntu?
** Changed in: firefox (Ubuntu) Status: Confirmed => Incomplete ** Tags added: feisty gutsy hardy -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/66350 Title: Firefox uses high CPU for extended periods of time when spawning a new window with many tabs already open Status in “firefox” package in Ubuntu: Incomplete Status in “firefox-3.0” package in Ubuntu: Won't Fix Bug description: If I have many browser tabs (in one or many windows) open already and I open a new window (either by clicking a link that opens a new window, implicitly having a window opened by a pop-up that slips through the cracks, or by invoking the "new window" action by the keyboard or menu), Firefox locks up (fails to repaint any of its windows) for an extended period of time (30 to 40 seconds is not unheardof) and uses 100% CPU. The time spent appears to be proportional to the number of tabs open. I took a preliminary look into Firefox with a debugger while it was doing this, and a few samples showed that it appeared to be spending some time laying out all of its pages that it had open again. I could be way off base, though; I took 5 or 6 non-scientific samples with control-c (gdb) bt, and I don't know Firefox's internals well enough to say that's what those functions actually did. It adversely impacts Firefox's usability. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/66350/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp