thanks, but hmmm, it didn't seem to particularly like loading that module:
Setting up libcanberra-gtk0:amd64 (0.30-10ubuntu1) ...
Setting up libcanberra-gtk-module:amd64 (0.30-10ubuntu1) ...
Processing triggers for libc-bin (2.35-0ubuntu3.1) ...
[email protected]:~$ firefox
Gtk-Message: 15:01:52.734: Failed to load module "canberra-gtk-module"
Gtk-Message: 15:01:52.736: Failed to load module "canberra-gtk-module"
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.
Missing chrome or resource URL: resource://gre/modules/UpdateListener.sys.mjs
And . . . a solve on github - sudo apt install xdg-desktop-portal-gtk didn't do much either.