Bug 683269 introduced the menubar appearance for the Event dialog toolbar (dark background under Ubuntu with Ambiance theme). With tabs on top Thunderbird is no more using this appearance and we should also revert to the default toolbar color.
Created attachment 646521 [details] patch This patch reverts the change done in Bug 683269. Should this land up to beta?
Comment on attachment 646521 [details] patch r=philipp. Since this doesn't seem to have bugged anyone so much, I think its safer to only land down to aurora. I'm open to reasoning why it should land on beta too though.
Pushed to comm-central: http://hg.mozilla.org/comm-central/rev/2a12990fa559 and comm-aurora: http://hg.mozilla.org/releases/comm-aurora/rev/4e82de0bf8fb