Same here. I've got a feeling that the bug emerged after the last flash plugin update. The plugin container can be terminated via kill though.
-- 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/764621 Title: /usr/lib/firefox-4.0/plugin-container hangs upon Firefox exit, which prevents computer shutdown from GNOME Status in “firefox” package in Ubuntu: Confirmed Bug description: Binary package hint: firefox Every time I exit Firefox before rebooting this host running a classic GNOME session, it hangs there, effectivel preventing the reboot from taking place unless Firefox is first force-killed. The cause seems to be that Firefox's plugin container has a dozen of Gnash sub-processes that won't terminate. ProblemType: Bug DistroRelease: Ubuntu 11.04 Package: firefox 4.0+nobinonly-0ubuntu2 ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2 Uname: Linux 2.6.38-8-generic i686 Architecture: i386 Date: Mon Apr 18 16:21:00 2011 FirefoxPackages: firefox 4.0+nobinonly-0ubuntu2 flashplugin-installer N/A adobe-flashplugin N/A icedtea-plugin N/A ProcEnviron: LANGUAGE=fi_FI:fi_FI.UTF-8:fi PATH=(custom, user) LANG=fi_FI.UTF-8 SHELL=/bin/bash SourcePackage: firefox UpgradeStatus: Upgraded to natty on 2009-09-14 (581 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/764621/+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