On Mon, 12 Jul 2021 at 21:57, René Neumann <lists@xxxxxxxxx> wrote: > Hi Andy, > > not a solution, but a hint to gather further infos: > > - use `xprop` to find infos about the window in question. Among other > things, this gives you a PID > > I figured it out. I Still don't know why it didn't show in any of the lists of apps/extensions... but... there was a hidden menubar in the actual player that had a link to uninstall youtube app.