Comment 2 for bug 269263

I can also confirm this as described by the original bug-reporter. This is however not only the case with firefox. Other applications like the "login window"-application (System->administration->Login window) also behave similar. If i switch between tabs, some part of the content in the new tab is rendered, but the tab itself is highlighted on the last one i visited. A new click, or alt-tab will trigger a complete render of the windowcontent and is then shown properly.
I didn't experience this before 10th of september.
I'll be happy to provide more info if that is needed. I have added some screenshots of the behaviour.