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when firefox starts the screen dims

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When I startup Firefox,the screen dims. When I go to the change brightness section in Windows 10 I find that the balanced button is now checked instead of the high performance button that is normally checked. If I shut down Firefox the brightness returns to normal and the high performance button is checked. I have a 2019 MSI 17 inch laptop running Windows 10. Any help would be appreciated.

Jim Farrell

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