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Firefox drawing a white bar over the window

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I have a dual monitor setup, one above the other with a slight offset, and when I use Firefox on the bottom monitor it draws a small white stripe above the window and blocks a bit off the top monitor's lower edge. Not a huge problem, but it's quite annoying. Any help would be very much appreciated.

I have a dual monitor setup, one above the other with a slight offset, and when I use Firefox on the bottom monitor it draws a small white stripe above the window and blocks a bit off the top monitor's lower edge. Not a huge problem, but it's quite annoying. Any help would be very much appreciated.
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Hi,

Try this:- just open firefox menu, then click on customize and unselect the "Title bar" checkbox.