Public bug reported:
Package: firefox from ppa:mozillateam/ppa
Version: 151.0.4+build1-0ubuntu0.24.04.1~mt1
Ubuntu: 24.04
Owned file: /etc/apparmor.d/usr.bin.firefox
The AppArmor profile shipped by this firefox package blocks Firefox's
"Open With" functionality. Firefox can show registered applications, but
the selected application is not executed.
Initial denial:
Firefox could not execute /usr/lib/x86_64-linux-gnu/glib-2.0/gio-launch-desktop.
After allowing that, Evince launched, but Xournal++ still failed because
the profile denied execution of /usr/bin/xournalpp-wrapper.
Audit line:
apparmor="DENIED" operation="exec" class="file" profile="firefox"
name="/usr/bin/xournalpp-wrapper" comm="gio-launch-desk" requested_mask="x"
denied_mask="x"
Local workaround:
Allow gio-launch-desktop and the selected handler/wrapper in
/etc/apparmor.d/local/usr.bin.firefox.
** Affects: firefox (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2156671
Title:
Firefox AppArmor profile blocks “Open With” desktop handlers via gio-
launch-desktop and app wrappers
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