I think we need all support we can get to fight Google on this, so I welcome Brave here actually.
Use this link to avoid going to Twitter:
https://nitter.kavin.rocks/BrendanEich/status/1684561924191842304
If you go to the about:config page you can edit browser.tabs.tabMinWidth down to 50 (default is 76) which lets you fit a bit more
If you want more than that it’s possible by editing the userchrome:
https://old.reddit.com/r/firefox/comments/zda0ov/can_i_get_below_50_tab_width/
Modifying userchrome is admittedly difficult if you’re not a developer… but not out of reach if you’re able to follow a guide.
I did set the tabMinWidth first, but the result was… lackluster… to say the least (I like having ~50-100 tabs per window…). However, I JUST found out about userChrome.css before you wrote, and also found code that worked for it!
For anyone else interested:
Guide on creating the userChrome.css file: https://www.userchrome.org/how-create-userchrome-css.html
Code that should be added to the file: .tabbrowser-tab { min-width: 1em !important; clip-width: 1em !important; }
