Arc and Zen browser have this neat feature where when playing music or podcasts or video, etc (any AV), a little media player appears in the bottom left corner of the browser (in the vertical tab sidebar) that shows the favicon of the site playing audio, allowing with media controls (back, play/pause, fwd, volume), as well as the media details when hovering over. I find this really helpful when playing media in the browser and navigating away from the media-playing site. allows for quick access, without having to rely solely on the Media Controls (keyboard) OS integration, that sometimes doesnt always play well, or will default to a different media app.
see attached screenshots for example. 
