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my firefox browser is oversizied when it opens up io don;t know how to get it back to regular size?

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well somehow my browser page covers the whole screen when i open it and i can;t see my bars on the bottom and i have to push my cursor all the way to the top of the page to see my tool bar and making the page go to the bottom of the screen.

well somehow my browser page covers the whole screen when i open it and i can;t see my bars on the bottom and i have to push my cursor all the way to the top of the page to see my tool bar and making the page go to the bottom of the screen.

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Hit F11 to exit Full Screen mode.