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pressed f3 key, how do i undo

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pressed the f3 key on imac and can't undo. Screen has 1 inch gap at bottom that now reveals dock and background photo. I can make the find in page bar close but not restore to full screen mode. Help Thank you

pressed the f3 key on imac and can't undo. Screen has 1 inch gap at bottom that now reveals dock and background photo. I can make the find in page bar close but not restore to full screen mode. Help Thank you

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I don't know what F3 does on your Mac.

On Mac you can toggle Full Screen mode with Command+Shift+F

You can try to rename/remove the xulstore.json file in the Firefox profile folder.

You can use this button to go to the current Firefox profile folder: