If I have a persona applied, and I enter full screen, then exit, the window that I entered full screen with has the grey titlebar re-appear, and has extra blank space under the titlebar where the persona is drawn (instead of drawing it into the titlebar). The URL I linked to is a screenshot of the problem. In the foreground is the window I fullscreened, and in the background is a window I didn't.
This is fixed in the current nightly by bug 522217.
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