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My display uses only the upper half of the display, how to revert to normal again?

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Apparently my daughter has found a shortcut for using only the upper part of the display? I can see no way of returning to normal view again. I really mean that only the upper part of the display is active, the display is NOT devided in two working halves.

Apparently my daughter has found a shortcut for using only the upper part of the display? I can see no way of returning to normal view again. I really mean that only the upper part of the display is active, the display is NOT devided in two working halves.

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What do you see in the bottom part?

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems