This is my custom css, it supports firefox themes, works on all operating systems, comes with a completely reworked devtools menu. The github link is in the comments

Séra Balázs@lemmy.world to Firefox@lemmy.ml – 69 points –
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I'll check it out as well. Definitely thanks for the customizing CSS idea. 😉

Thanks, and if you're intrested in a different look, you can look around the firefoxcss store: