Белая рамка активной темы - вырви глаз! Сделайте одну полоску с низу или с верху,будет само то..

Everything is perfect. If you could remove the grainy texture from top making it smooth it would be 5 star. Also but not that important at the tab section you could change the white outline with something darker, maybe a different shade of grey.

Absolute 5 star theme before the firefox 89 update, was basically my default theme, but the annoying white border on the current tab in this new version absolutely ruins it for me.

黒白濃淡がはっきりしていて見やすい、ショートカットが見つけやすい。