On Mon, 10 Aug 2020 at 11:20:33 +0000, Marcin Szamotulski wrote: > Trying to share a gnome-terminal window in firefox (firefox-79.0, but > also in previous versions of firefox).
If you're in the default (Wayland) GNOME session, gnome-terminal doesn't have any X11 windows. I suspect Firefox can only share X11 windows. Please try this workaround (this assumes you are using gdm, other display managers will probably have a similar flow): - save documents, etc. - log out - choose/enter your username - before typing your password, click the gear-wheel icon and select session type "GNOME on Xorg" - finish logging back in If that is successful, then my guess about the cause was probably correct. The long-term solution to window and desktop sharing in GNOME Wayland sessions is to use Pipewire, but the version of Pipewire currently in Debian is too old (#954022) and Firefox doesn't support it yet anyway (https://bugzilla.mozilla.org/show_bug.cgi?id=1430775). smcv