It’s an HTML-like language that defines the browser’s interface, you can use it to change the shapes, positions, colors, whatever of your toolbars and tabs. Also they do still have customization via userChrome.css and I think you can re-enable XUL if you dig enough? It does get mixed a bit with HTML-namespaced tags too.
It’s an HTML-like language that defines the browser’s interface, you can use it to change the shapes, positions, colors, whatever of your toolbars and tabs. Also they do still have customization via userChrome.css and I think you can re-enable XUL if you dig enough? It does get mixed a bit with HTML-namespaced tags too.