URLs fail to launch in Firefox

[Dave Jones]

Opening a PDF under evince, then clicking an https: link within the PDF fails to open the link in Firefox. On the command line, evince reports:

$ evince test.pdf
env: ‘/snap/bin/firefox’: Permission denied

In dmesg, the following message appears each time the link is clicked:

[ 1366.891145] audit: type=1400 audit(1672910889.559:286): apparmor="DENIED" operation="exec" profile="/usr/bin/evince" name="/usr/bin/snap" pid=14698 comm="env" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0

This may be related to (or a regression of?) LP: #964510 as it's clearly aa related, but I don't think it's a direct duplicate given the audit log is rather different.

[Dave Jones (waveform)]

Adding a trivial test PDF