Still has its issues with certain sites, but works quite well overall.

very good

Usually good, but for some reason sometimes it becomes so heavy it crashes my whole laptop.

Workes very good, can recommend it to anyone.
However, I'm not using it anymore at the moment, because I somehow wasn't able to use any browser theme with it. Maybe I'm just too incompetent to find the right setting, but I if you want to use your usual Firefox theme I'd tell you not to use this.
But, as I said, I'm very impressed by the quality of the CSS filtering, and if you just care about that you should definitely give it a go.

nice

la mejor estension para modo oscuro :)

The Best Dark Mode Extension I have Ever Use! Thank you...

After using this add-on for a decent time I gotta state it's dynamic mode is the absolute killer for any another competitor so far I've tried. Extra tweaks also let me tune pretty much every website I use on a daily basis to perfection making a drastic change in everyday business processes by far. I like Star Wars, but I'd rather appreciate a Sun/Moon kinda icon thing with basically minimalist approach that would correlate dope with dark themes. I might have to contact the Dev to talk about engines and stuff.