It's simple and it works. Having this add-on saved me the time of updating my old toggle doc colors add-on to work with Web Extensions, so thank you!

Works as advertised. 4 Stars for being effective and simple.

Would be nice if you have a black-list of domains it works on automatically though, so not 5 stars ;)

It's a useful extension for Firefox Quantum. The ability to put the On/Off toggle in the address bar gives me the ability to reduce eyestrain by SHUTTING DOWN all those BLINDING WHITE websites!!!! I can reset every page at need to a soothing Lite Grey Background.

Why do all Programmers and Web Developers think everyone is from Krypton or something?!?!? Everything is Great...until your head starts SPLITTING!

Kudos, Manuel!