Firefox CSS files
userChrome-v1.css
userChrome-v2.css
userChrome-v3.css (Firefox 133)
userContent-v1.css
v2-menus.css
v2-tabs-bar.css
v2-tabs-bar2.css (updated for Firefox 133)
v2-tabs-to-below.css
v2-tabs-to-below2.css
v2-tabs-to-below3.css (Firefox 133)