minimal-one-line-firefox
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Custom userChrome for Firefox to minimize the space used for url and tab bar
minimal-one-line-firefox
Custom userChrome for Firefox to minimize the space used for url and tab bar:

Working as of Nov. 6th 2022: Firefox 107.0b8 on Fedora 36 and 106.0 on Manjaro.
Prerequisites & Setup
Go to about:config and set toolkit.legacyUserProfileCustomizations.stylesheets to true
browser.compactmode.show should also be set to true and enabled (see: Ghacks article)
After doing this, Firefox will try to load userChrome.css from the chrome folder inside your FF profile.
Use about:support to find the path to your profile folder. Example: /home/USERNAME/.mozilla/firefox/abc1234.dev-edition-default/chrome/
Themes
Feel free to use a theme of your choice with these styles.
Tested with the default themes (light, dark, alpenglow) as well as a Nord theme (used in the screenshot above, source).
Credits
This stylesheet is based on:
- https://github.com/khuedoan/one-line-firefox
- https://github.com/MrOtherGuy/firefox-csshacks