I don't think that there is an add-on for that. But the best you can do is change the Firefox window color with the add-on AnyColor. Or you can try to change your screen brightness level to make it seem less bright or vice-versa.
I don't think that there is an add-on for that. But the best you can do is change the Firefox window color with the add-on AnyColor. Or you can try to change your screen brightness level to make it seem less bright or vice-versa.
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