The top 2-3cm of Firefox disappears when the window is maximized
I have Firefox 78.0.2 x64 on Windows 10, latest updates. If I restore down my Firefox application window, everything functions fine. However, when I maximize the window, the top inch or more of the Firefox application turns completely white and all controls disappear. Pressing F11 makes the web page zoom bigger (hiding address bar, favorites, status bar, etc.), then pressing F11 again makes them appear. Has anyone else had this issue? Is this a bug, or a graphics card issue?
Solution choisie
So, it turned out to be nothing with Firefox, I started having that problem with all open apps. Apparently there was a pending update in Windows. Once I installed that and rebooted, the problem went away.
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Try to rename/remove xulstore.json in the Firefox profile folder with Firefox closed.
You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.
- Help -> Troubleshooting Information -> Profile Folder/Directory:
Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder - https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
Solution choisie
So, it turned out to be nothing with Firefox, I started having that problem with all open apps. Apparently there was a pending update in Windows. Once I installed that and rebooted, the problem went away.