userContent.css https://superuser.com/questions/318912/how-can-i-override-the-css-of-a-site-in-firefox-with-usercontent-css https://superuser.com/questions/318

userContent.css https://superuser.com/questions/318912/how-can-i-override-the-css-of-a-site-in-firefox-with-usercontent-css https://superuser.com/questions/318912/how-can-i-override-th... You need to enable it in about:config these days https://www.userchrome.org/firefox-changes-userchrome-css.html https://www.userchrome.org/firefox-changes-userchrome-css.ht...