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Control button use shrinks text

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When I use the Control button my screen text shrinks by 10 to 20%. I can't copy or copy/paste without this causing the text to resize. Please help.

When I use the Control button my screen text shrinks by 10 to 20%. I can't copy or copy/paste without this causing the text to resize. Please help.

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Did you try to close and restart Firefox or reboot the computer as that is the first to try with such weird behavior ?