Full screen does not go completely full screen, black bar.
I always have Firefox in full screen. When I first open Firefox, it does not go completely full screen. It will leave black bars on the right and bottom portion of the screen. I will then have to press F11 to exit out of full screen and then F11 again to return to full screen, which solves the problem. I will have to do this every time I close and then re-open Firefox. I have disabled Add-ons, tried in safe mode, removed hardware acceleration, and all other suggestions on the support page. None of which helped. What is causing this problem. Thank you.
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Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
- Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
- Do NOT click the Reset button on the Safe Mode start window
- https://support.mozilla.org/kb/Safe+Mode
- https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Try to rename (or delete) the xulstore.json file in the Firefox profile folder. You can use this button to go to the currently used Firefox profile folder:
- Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
- http://kb.mozillazine.org/Profile_folder_-_Firefox
Thank you for your help cor-el. I have tried your solutions but they have not solved the problem.
Can you drag the window wider if you leave maximized mode?
Yes I can do that. This problem only happens when I first open Firefox or close Firefox and then reopen it. Firefox remembers the window size after closing and and then always reopens in your last window size state. If I don't have the window in full screen mode when I close, it opens normally. When I press F11 (to leave full screen mode) and then F11 to return, the resizing back to full screen mode will solve the problem.