Thanks now i can make my youtube into a underground dungeon

so slowly to access website download stylish theme.

es genial :D

It does not let me do anything I have installed many times but it still does not work

** NOTICE **
Don't use this abandoned project anymore. I read it has analytics tracking as well. Use the fork called Stylus instead: https://addons.mozilla.org/en-US/firefox/addon/styl-us/

TL;DR: ** Use STYLUS instead! **