Might look at [Aris-t2/CustomCSSforFx: Custom CSS tweaks for Firefox 57+](https://github.com/aris-t2/customcssforfx) which has many tweaks to change the appearance. My tabs now match what they did before when I was using Classic Theme Restorer.

Everything updates, and when it does it's always for the worse. Death, taxes, war, shitty UI gets shittier; nothing ever changes.

This is probably just me personally, but why would they change the UI to make unimportant things bigger and take up more space. Why are tabs so much larger now but the text within remains the same? Why is there so much empty space? 

FUCK. stop fucking with what was good

Terrible UI