Rated 5 out of 5 stars

Another really, really nice add-on that hopefully can someday soon be ported over to this new Quantum thing. It needs it!

This review is for a previous version of the add-on (1.6.0). 

Use custom CSS code for Firefox 57+ ( https://github.com/Aris-t2/CustomCSSforFx/issues/2 ) to keep classic ui features