To mitigate this you can go to about:config (write it in the address bar) and search for a setting called browser.tabs.tabMinWidth, I usually change the number to 20 (the default minimum width is like 70) and tabs are allowed to become roughly as narrow as in chrome. It's a much simpler and stabler option compared to custom CSS
Now fix the fact that I have too slowly scroll horizontally through all my tabs because they are individually too wide for the number I have open.
To mitigate this you can go to about:config (write it in the address bar) and search for a setting called
browser.tabs.tabMinWidth
, I usually change the number to 20 (the default minimum width is like 70) and tabs are allowed to become roughly as narrow as in chrome. It's a much simpler and stabler option compared to custom CSS