Change
The opt-in --uc-hide-urlbar-buttons toggle now also clears the picture-in-picture button from the address bar. Until now it slipped past the toggle and stayed on screen while every other clutter icon was gone. With the default settings PiP is untouched: it keeps appearing while a video plays, so it still works as a reminder of where that video lives. Only those who set the toggle to hide all address-bar buttons now lose it along with the rest.