Dark Green от Zorz

UPDATE - 2021-08-19 - Version 1.3: changed the tab_background_text color slightly so that it once again triggers the dark context and system menus in the new UI.

UPDATE - 2021-07-13 - Version 1.2: Added popup_border color to remove the light-gray border on some popups and menus that were added in Firefox 90.0

UPDATE - 2021-07-05 - Version 1.1: Tweaked tab_line color. This time it actually does highlight the current tab better than before.

If you would prefer the previous version(s), please see https://addons.mozilla.org/en-US/firefox/addon/zorz-dark-green/versions/