On: Firefox 57.0 Released

[plopz]

Unfortunately, I don't think theres ever going to be a Classic Theme Restorer equivalent that works going forward.

https://bugzilla.mozilla.org/show_bug.cgi?id=1328244

[KozmoNau7 → plopz]

A lot of that stuff is built into the browser, for people who care to look through the customization options and possibly do a tiny bit of about:config tweaking.

[electrotype → plopz]

Have a look at https://github.com/Aris-t2/CustomCSSforFx , it can do many things, even if it's not a perfect Classic Theme Restorer replacement.