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why is my space bar moving my computer screen down?

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I can't see to figure out why my down arrow key on my laptop isn't working. All of the other arrow keys seem to be working perfectly fine except for the down arrow one. Somehow my space bar is now the key to control my screen from moving down. I've looked through my setting to see if there was something in there to change to fix the issue, but there was not any sadly. I've also tried playing a games to see if it would work. Pac man to be exact because you uses all the arrow keys to play which did not work. The down arrow still did not work and the space bar acted as the down arrow for everything else except on the game. Does anyone else have this problem or know how to fix this problem? By the way i have a Chromebook

I can't see to figure out why my down arrow key on my laptop isn't working. All of the other arrow keys seem to be working perfectly fine except for the down arrow one. Somehow my space bar is now the key to control my screen from moving down. I've looked through my setting to see if there was something in there to change to fix the issue, but there was not any sadly. I've also tried playing a games to see if it would work. Pac man to be exact because you uses all the arrow keys to play which did not work. The down arrow still did not work and the space bar acted as the down arrow for everything else except on the game. Does anyone else have this problem or know how to fix this problem? By the way i have a Chromebook

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Is there a version of Firefox that runs on Chromebook? Where did you install from?

As a point of reference, on Windows, when the focus is not in a text editing control, Spacebar functions like Page Down (Shift+Spacebar functions like Page Up).