Exit Full Screen - since the latest update
Since updating, "Exit Full Screen" now causes viewed page to become a narrow sliver at the top of the screen, and the page unusable. I typically drag pictures from my desktop to Facebook, etc., but can no longer do that. (I know there is another way to access pictures from the desktop, but it is currently unreliable on my machine, which is very slow and wonky right now.) Can I revert to the former function where "Exit Full Screen" just makes the page smaller but still usable?
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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 -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).
- Help -> More 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