Allegedly, on or about 20 May 2018, Tom Horsley sent:
I gave up on trying to get direct access as a different
user to the display, sometimes it would work, sometimes
it wouldn't work, and I could never track down why.
Firefox had a habit of always trying to use the local browser window.
I seem to recall that adding --no-remote to the command line worked
around that foible.
--
[tim@localhost ~]$ uname -rsvp
Linux 4.16.7-100.fc26.x86_64 #1 SMP Wed May 2 21:45:56 UTC 2018 x86_64
Boilerplate: All mail to my mailbox is automatically deleted.
There is no point trying to privately email me, I only get to see
the messages posted to the mailing list.
When I write something, take it as meaning exactly what I wrote.
Do not interpret it.