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Blank gap over the browser tab

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William
William
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As you can see from the images, there is a blank gap over the tab when I open FireFox (image 1), but the gap will disappear when I restore and maximize the window again (image 2). How can I eliminate this gap?

As you can see from the images, there is a blank gap over the tab when I open FireFox (image 1), but the gap will disappear when I restore and maximize the window again (image 2). How can I eliminate this gap?
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