This works pretty well, though I've barely tested it out. I did have to disable it on google.inbox.com, as it broke the page a little bit, or made certain things invisible.

I love and recommend this Dark background and light text extension. I use this with the dark default theme of Mozilla and Black New Tab of Mr. Yoasif. Dear designer behind this fantastic extension, Mr. Mikhail Khvoinitsky, I thank you so much for your worthy and beneficent work. Hats off to you!

App intercepts website's style sheet and reloads the website twice, slowing it down. While I appreciate being able to change the ubiquitous gray text to black, with today's css-driven design and perennial screen overlays, I frequently have to disable this app.

Muy buena la extensión, soy de usar la pc de noche y con poca luz. Me vino perfecta para no matarme los ojos con lo blanco de ciertas paguinas

very powerful and great, love it

great add-ons

very useful app when the screen is too bright. i recommend it !

Good

exactly what i need

Comfortable, customisable.

Great extension. Have been using it for a very long time. First I used it to save battery on my AMOLED screen because of the black backgrounds. In the meantime I can't read on white backgrounds anymore. It is much better for my eyes to avoid these bright white backgrounds. Even on my LCD PC screen I use it in the meantime. To be honest - without this addon I would not use this always crashing Android Firefox one minute longer. So far I couldn't find an other browser enabling black backgrounds on Android in a way as this addon does.