This just happened to me on 13.04, I believe due to unity crashing. Editing sizemode="fullscreen" to "normal" solved the problem too.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/196058 Title: Thunderbird starts in a full-screen mode and cannot be restored Status in Mozilla Thunderbird Mail and News: New Status in “thunderbird” package in Ubuntu: Confirmed Bug description: WORKAROUND: 1. Edit ~/.thunderbird/*/localstore.rdf 2. Search for: sizemode="fullscreen" 3. Change it to: sizemode="normal" ORIGINAL DESCRIPTION: Binary package hint: thunderbird I've tried clicking F11 in various of places and even all the rest of F-buttons, with Alt/Shift/Ctrl, and still no result. I've scrolled throughout the whole advanced configuration and there was nothing about full-screen mode. I don't have any extensions yet installed on my Thunderbird and I don't know what to do next. The problem has it basics because the profile that I've switched to, comes from previous Windows installation. I'm begging for Your help. It is stupid but really frustrating. ProblemType: Bug Architecture: i386 Date: Wed Feb 27 10:05:55 2008 Dependencies: DistroRelease: Ubuntu 8.04 Package: mozilla-thunderbird None [modified: /var/lib/dpkg/info/mozilla-thunderbird.list] PackageArchitecture: all SourcePackage: thunderbird Uname: Linux 2.6.24-10-generic i686 To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/196058/+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