[Bug 1974449] [NEW] No filepicker in Firefox with enforced AppArmor profile

[Gyorgy Kortvelyessy]

Public bug reported:

# System
Ubuntu 22.04 LTS (Jammy Jellyfish) {kubuntu-ppa/backports/ubuntu jammy main | mozillateam/ppa/ubuntu/ jammy main}
Package: firefox
Version: 100.0.1+build1-0ubuntu0.22.04.1~mt1
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# Description
I’m using Firefox stand-alone package (not the mainline Ubuntu Snap version) under KDE (native KDE filepicker) with enforced `usr.bin.firefox AppArmor` profile (included in `firefox` package) and when I try to open a file, save a screenshot or print to file, no filepicker shown.
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# Error message
Can't open portal file chooser: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: An AppArmor policy prevents this sender from sending this message to this recipient; type="method_call", […] interface="org.freedesktop.portal.FileChooser" member="OpenFile" […] destination="org.freedesktop.portal.Desktop" […])
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# Suggested fix
Please see commit:
https://github.com/snapcore/snapd/pull/8793/files/ec7f01e8c15bf9303cfb30354470d2a7b3783f25

# Fix result
Implementing the part for `org.freedesktop.portal.Desktop` from the above commit resolves the filepicker issue.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apparmor firefox kde

** Attachment added: "Firefox debug output"
   https://bugs.launchpad.net/bugs/1974449/+attachment/5591571/+files/firefox_100.0.1+build1-0ubuntu0.22.04.1~mt1_amd64.ansi_vt

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Title:
  No filepicker in Firefox with enforced AppArmor profile

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