Have you tried using Vivaldi? It&#x27;s awfully slow to respond to user interaction because it&#x27;s all HTML. Say what you want about XUL, but for something aiming to be like HTML it never felt slow. If Vivaldi&#x27;s non-existing responsiveness is what the new Firefox will be, then they should seriously consider to rewrite the whole thing like a game (in OpenGL&#x2F;Vulkan) instead. Oh and XUL was optimized for memory efficiency, which will have to be reoptimized for the HTML-only interface, but that can benefit the whole web.