Changes to make the new proton UI redesign in Firefox better; including changes to tabs, tab indicator, compact mode-reduced height, proton gradient accents in elements, bookmarks-bar-appear-on-hover and much more. All testing done in latest nightly versions with Proton enabled.

Works best with default dark theme and alpenglow theme. Compact mode enabled.

How to add stylesheets: https://winaero.com/enable-loading-userchrome-css-usercontent-css-firefox/

Pending fixes.