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

This looks hella clean!

I'll check it out as well. Definitely thanks for the customizing CSS idea. 😉

https://github.com/Bali10050/FirefoxCSS

I like it, I'll give a try after work today. Thanks for sharing :)

Just applied it. Super cool!