Good theme, but there is a few lacks (sorry for bad english): - light new tab page colors - white line under tabs (at least in Firefox 91) - too dim color of font in adress bar (except white font of current domain) All the rest are very similar to Compact Dark theme from Firefox 53 (which is very good).
It is meant to be used with custom userChrome.css enabled via about:config based on this repo: https://github.com/ran-sama/firefox-preferences#the-esr-78-look-is-finally-possible-on-esr-91
