it works but the website is incredibly slow please fix it it takes like 10 minutes to load the site and it always gives bad gateway errors

I didn't install this ! It was installed by some devious means I am not aware of. I'm reporting this to Mozilla.

IT STEALS YOUR DATA

JUST GET STYLUS THIS STEALS YOUR DATA even firefox reccomended stylus not this data collector

STOP: PRIVACY WARNING!

Install STYLUS instead.

This extension, Stylish, was once the industry standard, but it is now malware. STYLUS is maintained by an active and friendly community of developers, and does not send your browsing information to privacy thieves.

Super slow and doesn't work properly.

TOP

all of its webpages load super slow and when i click to install a theme it just loads forever

DO NOT USE. Steals your browswer history. See https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/

ES MARAVILLOSO!! <3

I loved this extension before, but now with this new version, it's a crap:
On Firefox Quantum it give an huge CPU usage...
So with Quatum, it is better to use Stylus.

On Waterfox Classic 56.3 (my principal browser):
I use an older version with an userscript to edit my userstyles easily and here that's my better solution.