@KitsuneVixi @mcc Tested it on FF 138.0.4 on Win10, it adjusts the tab size on a 1280x1080 window when you get enough tabs to fill the header bar that they start scrolling. Did not get it to happen on 128.9 ESR on Debian 12 with KDE 5.27. On that system, it only shows the speaker icon when hovering over the site icon. It shows "playing" or "muted" under the tab title. I should note the screen on the Debian system is 900x1600 portrait mode. Maybe that changes its function. 🤷‍♀️