Hi!, I would like to share with you all a theme/tweak I was able to achieve using the legacy support of UserChrome.css [pals at Mozilla please, please never depreciate that feature] it works ok on desktop build 108.0.1, hopefully it gets implemented natively and if you are able to improve it please do!
I'll not post tutorial links here to avoid breaking any forum rules BUT If you're interested on trying it look up
"Firefox UserChrome.css" 😀
(Literally just needs a toggle on the settings, create a folder and paste in there the attached file 😉)
Download Link