InvertColors is a light and useful extension for Firefox that, as the name suggests, inverts the colors, in this case the colors of HTML and the colors of CSS templates. InvertColors mostly alters the opposite tones (black passes it to white). In case of disabling the option of preserving the colors that comes by default, the changes are more radical, changing colors such as blue for yellow, for example.
It includes a configuration menu to set the program parameters according to our tastes. InvertColors does not compromise the operating system or Firefox: it only affects aesthetics, not its operation. InvertColors is free and works with Firefox 3.0 (or higher).
You can free download InvertColors 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.