Description of problem: Clicking on "Firefox on Wayland" application in a GNOME on Xorg session, silently fails.


Version-Release number of selected component (if applicable):
firefox-wayland-65.0-1.fc29.x86_64
firefox-65.0-1.fc29.x86_64


How reproducible:
Always


Steps to Reproduce:
1. Login choosing GNOME on Xorg session
2. Click on the Firefox on Wayland application icon
3.

Actual results:

"Firefox on Wayland" application menu item appears on the upper left side (to the right of Activities), and the mouse arrow becomes a spinner which spins for maybe 15 seconds then both of these go away. No error messages or dialogs.

Expected results:

I should get a dialog to the effect that this application can't run in an Xorg session. Or perhaps even better is a unified application that detects the session and launches the application appropriately for that session: Wayland or Xorg.


Additional info:

The journal records one line at the time of the launch:

Jan 31 23:32:31 flap.local firefox[13165]: cannot open display: :0