Make every web page (or just the pages you want) display light text on dark backgrounds. All color variations are fully customizable.
https://addons.mozilla.org/en-GB/firefox/addon/dark-background-light-text/
Make every web page (or just the pages you want) display light text on dark backgrounds. All color variations are fully customizable.
https://addons.mozilla.org/en-GB/firefox/addon/dark-background-light-text/