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Opening Firefox

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When I open Firefox, it is only a quarter of the browser in the right-upper quarter of the screen. How can I make it so the browser opens fully in the entire screen.

When I open Firefox, it is only a quarter of the browser in the right-upper quarter of the screen. How can I make it so the browser opens fully in the entire screen.

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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) to go to the current Firefox profile folder or use the about:profiles page (Root directory).