This addon isn't what it used to be. Now the only thing it does is not working! I installed 2 dark themes for Yandex and not only none of them appeared as "installed" in the addon (next to "library") but they also didn't have any effect on the yandex page.
Deleting from the browser, it's not worthy to waste my time with this crap.

Spyware; use Stylus instead.

the best site i love it

THE BEST

fajne

Spyware

spyware people, spyware people!!!

Not only does this use an excessive amount of CPU (terrible battery drain on Android), it really should be removed from Firefox add-ons because it's spyware.