apparmor prevents firefox from sending mails

[Hadmut Danisch]

since activating apparmor, the send link mail function (you need to customize the tool bar and add the letter symbol) does not work anymore.

Reason:

kernel: [14170.598883] audit: type=1400 audit(1577746984.736:820): apparmor="DENIED" operation="exec" profile="/usr/lib/firefox/firefox{,*[^s][^h]}" name="/usr/lib/x86_64-linux-gnu/glib-2.0/gio-launch-desktop" pid=12565 comm="firefox" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0

apparmor keeps firefox from launching
/usr/lib/x86_64-linux-gnu/glib-2.0/gio-launch-desktop", "thunderbird", "mailto:?body=https%3A%2F ...

I'm not absolutely sure, whether this is a bug or security-intentional behaviour, but in general, firefox should work or have special apparmor proof mail programs.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: firefox 71.0+build5-0ubuntu0.19.10.1
ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
Uname: Linux 5.3.0-24-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
BuildID: 20191205203726
CurrentDesktop: LXQt
Date: Tue Dec 31 00:09:15 2019
InstallationDate: Installed on 2019-11-30 (30 days ago)
InstallationMedia: Lubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017.1)
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)