https://mastransky.wordpress.com/2020/03/16/wayland-x11-how-to-run-
firefox-in-mixed-environment/ is useful to understand the problem.
As suggested there, exporting MOZ_DBUS_REMOTE=1 when running in a
wayland session works around the problem.
I can observe the problem in a wayland session if I launch e.g. vlc with
GDK_BACKEND=x11 and then click a link in the app (e.g. in the about
dialog). With MOZ_DBUS_REMOTE set, the problem is gone.
** Changed in: firefox (Ubuntu)
Status: New => Confirmed
** Changed in: firefox (Ubuntu)
Importance: Undecided => High
** Changed in: firefox (Ubuntu)
Assignee: (unassigned) => Olivier Tilloy (osomon)
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https://bugs.launchpad.net/bugs/1921931
Title:
Opening links results in "Firefox is already running, but is not
responding"
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