I am writing to suggest a specific UI gesture for Firefox on Android that would allow me to switch to it completely. Currently, I only keep Brave installed because of its superior YouTube navigation. In Brave, you can drag down from the top of a YouTube video to instantly trigger portrait fullscreen mode. This gesture is fast, intuitive, and much more efficient for one-handed mobile viewing than hunting for a small fullscreen button. Please consider adding this "drag-to-fullscreen" support to Firefox so users can enjoy the best ad-blocking (uBlock Origin) alongside the best mobile video navigation.