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Why does Firefox open in small window?

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When I open Firefox on a MacBook Pro the screen opens in a small window. How do I get Firefox to open normally?

When I open Firefox on a MacBook Pro the screen opens in a small window. How do I get Firefox to open normally?

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You can 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.

The Firefox profile folder is in a hidden location in the Library folder in your user directory (~/Library is a hidden folder).

  • ~/Library/Application Support/Firefox/Profiles/<profile>/