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Extensions 
Chrome
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Adjust Screen Brightness
Control your browser's global screen brightness to use sites that do not support the native dark theme
Video Styler (brightness and more)
Extension allows you to adjust the brightness for all video players on websites, as well as apply advanced filters to video!
Sites Dimmer - sharp brightness reduction
Extension automatically dims bright sites (which are not in a dark mode) to a desired level!
Adjust Screen Brightness
This extension reduces the screen brightness level for both daytime and night time