It hangs hard whenever I toggle it. It make other apps running in background crash too including Firefox.

Slows down Firefox so badly. Even slows down my TST set up, which is fine with other darkify extensions. The features and capabilities are amazing, but this resource hog made using firefox unbearable in some situations, so I have had to remove it in favor of a more simple extension that still gets the main job done without slowing down my browser.

После установки расширения, ни сайты почти не грузятся, ни сам браузер. Даже в настройки с трудом входит, чтобы удалить расширение.
Firefox Quantum 60.0.2 (64-бит)

Not working!

I can't help but assume there is a bug, but while Dark Reader works as advertised, it completely destroys performance. I'm using a 2017 Macbook Pro and viewing even the simplest pages result in extremely laggy scrolling, page load, and even closing Firefox sometimes hangs. I initially assumed it was a problem with Firefox, but as soon as I removed Dark Reader, everything was fine again.

Not working...!