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When JavaScript opens up a child window, the Firefox 4 tab bar messes up like this:

The weird bug.

Note that the screenshot is NOT cut off... The tab itself is shifted up higher than it should be. When I restore the window (unmaximize it), and then maximize it again, the tab bar shifts back down to its normal position:

Normal behavior

Has anybody else run into this bug, and how do I fix this? It's really annoying!

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Yes, it's a bug.

No, I don't think there's any way to fix it. You can avoid it by somehow having the tab bar visible beforehand, though.

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