A proposito de iste extension

Screen Dimmer - Dims your screen to reduce eye strain and improve comfort!

Dark Overlay: It usually works by placing a semi-transparent dark layer over the webpages you are viewing within Browser. It doesn't typically control your monitor's actual backlight.
Adjustable Dimness: You can almost always adjust the level of dimness or the opacity of the dark overlay, allowing you to fine-tune the brightness to your comfort level.
Easy Toggling: Most provide a simple button in your Browser toolbar to quickly turn the dimming effect on or off.

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