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My horizonal scroll bar appears, then later disappears, and I have to restart firefox to get it back

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When I first open Firefox, the horizontal scroll bar appears at the the bottom of the screen. After a while, the horizontal scroll bar disappears. The only way I can make it reappear is to close the browser and restart it.

When I first open Firefox, the horizontal scroll bar appears at the the bottom of the screen. After a while, the horizontal scroll bar disappears. The only way I can make it reappear is to close the browser and restart it.

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It is possible that the screen is too high and that the scroll bar and the find bar and add-on bar fall off at the bottom.

Open the system menu via Alt+Space and see if you can resize that window.

If that works then close Firefox (File > Exit/Quit) to save that setting.

See also:

If the above didn't help then see: