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multi-row tabs in Firefox Quantum

From here you can use this file.

And just put it into your profile directory like this:

~/.mozilla/firefox/horp5zpu.default/chrome/userChrome.css

Don't install the whole git repository, it is just clutter and not worth it. You can change the CSS file to make the tabs more managable. I recommend setting max and min width to 174px and also set "max-height: unset !important;" for "#tabbrowser-tabs".