I fiddled for a while with DarkReader but found Stylus to be more complete, although one has to spend some time to find or build their preferred dark theme. Als

I fiddled for a while with DarkReader but found Stylus to be more complete, although one has to spend some time to find or build their preferred dark theme. Also beware that, for reasons I don't understand, activating a theme doesn't deactivate the previous one unless that is explicitly done, which can lead to misleading results. https://addons.mozilla.org/en-US/firefox/addon/styl-us/ https://addons.mozilla.org/en-US/firefox/addon/styl-us/