[Bug 1971475] [NEW] Ubuntu 22.04 snap firefox doesn't save downloads to /mnt subfolders

[pnck]

Public bug reported:

When I try to download file or save page to hard disks mounted to /mnt
download process doesn't start. However download to /media works as
expected. Moreover another snap GIMP saves files to /mnt. Snap
connection to removable-media is done.

pnck at ubuntupc:~$ lsb_release -rd
Description:	Ubuntu 22.04 LTS
Release:	22.04

pnck at ubuntupc:~$ apt-cache policy firefox
firefox:
  Installed: (none)
  Candidate: 1:1snap1-0ubuntu2
  Version table:
     1:1snap1-0ubuntu2 500
        500 http://ru.archive.ubuntu.com/ubuntu jammy/main amd64 Packages


pnck at ubuntupc:~$ snap info firefox
name:      firefox
summary:   Mozilla Firefox web browser
publisher: Mozilla✓
store-url: https://snapcraft.io/firefox
license:   unset
description: |
  Firefox is a powerful, extensible web browser with support for modern web application
  technologies.
commands:
  - firefox
snap-id:      3wdHCAVyZEmYsCMFDE9qt92UV8rC8Wdk
tracking:     latest/stable/ubuntu-22.04
refresh-date: 2 days ago, at 19:34 MSK
channels:
  latest/stable:    99.0.1-1    2022-04-13 (1232) 163MB -
  latest/candidate: 100.0-2     2022-05-02 (1300) 168MB -
  latest/beta:      101.0b1-1   2022-05-03 (1306) 169MB -
  latest/edge:      102.0a1     2022-05-03 (1307) 180MB -
  esr/stable:       91.8.0esr-1 2022-04-05 (1184) 161MB -
  esr/candidate:    91.9.0esr-1 2022-04-27 (1284) 161MB -
  esr/beta:         ↑                                   
  esr/edge:         ↑                                   
installed:          99.0.1-1               (1232) 163MB -


pnck at ubuntupc:~$ snap connections firefox
Interface                 Plug                            Slot                             Notes
audio-playback            firefox:audio-playback          :audio-playback                  -
audio-record              firefox:audio-record            :audio-record                    -
avahi-observe             firefox:avahi-observe           :avahi-observe                   -
browser-support           firefox:browser-sandbox         :browser-support                 -
camera                    firefox:camera                  :camera                          -
content[gnome-3-38-2004]  firefox:gnome-3-38-2004         gnome-3-38-2004:gnome-3-38-2004  -
content[gtk-3-themes]     firefox:gtk-3-themes            gtk-common-themes:gtk-3-themes   -
content[icon-themes]      firefox:icon-themes             gtk-common-themes:icon-themes    -
content[sound-themes]     firefox:sound-themes            gtk-common-themes:sound-themes   -
cups-control              firefox:cups-control            :cups-control                    -
dbus                      -                               firefox:dbus-daemon              -
desktop                   firefox:desktop                 :desktop                         -
desktop-legacy            firefox:desktop-legacy          :desktop-legacy                  -
gsettings                 firefox:gsettings               :gsettings                       -
hardware-observe          firefox:hardware-observe        :hardware-observe                -
home                      firefox:home                    :home                            -
joystick                  firefox:joystick                :joystick                        -
mpris                     -                               firefox:mpris                    -
network                   firefox:network                 :network                         -
network-observe           firefox:network-observe         -                                -
opengl                    firefox:opengl                  :opengl                          -
personal-files            firefox:dot-mozilla-firefox     :personal-files                  -
removable-media           firefox:removable-media         :removable-media                 -
screen-inhibit-control    firefox:screen-inhibit-control  :screen-inhibit-control          -
system-files              firefox:etc-firefox-policies    :system-files                    -
system-packages-doc       firefox:system-packages-doc     :system-packages-doc             -
u2f-devices               firefox:u2f-devices             :u2f-devices                     -
unity7                    firefox:unity7                  :unity7                          -
upower-observe            firefox:upower-observe          :upower-observe                  -
wayland                   firefox:wayland                 :wayland                         -
x11                       firefox:x11                     :x11                             -

pnck at ubuntupc:~$ ls -la /mnt/
total 16
drwxr-xr-x  4 root root 4096 May  1 20:00 .
drwxr-xr-x 20 root root 4096 May  1 19:36 ..
drwxr-xr-x 11 pnck pnck 4096 May  3 13:33 Data
drwxrwxr-x  8 pnck pnck 4096 Jun  5  2021 VMs

pnck at ubuntupc:~$ mount | grep -e firefox -e mnt -e gimp
/var/lib/snapd/snaps/firefox_1232.snap on /snap/firefox/1232 type squashfs (ro,nodev,relatime,errors=continue,x-gdu.hide)
/var/lib/snapd/snaps/gimp_383.snap on /snap/gimp/383 type squashfs (ro,nodev,relatime,errors=continue,x-gdu.hide)
/dev/sda1 on /mnt/VMs type ext4 (rw,nosuid,nodev,relatime,uhelper=udisks)
/dev/mapper/data_vg-data_lv on /mnt/Data type ext4 (rw,nosuid,nodev,relatime,uhelper=udisks)
nsfs on /run/snapd/ns/snapd-desktop-integration.mnt type nsfs (rw)
nsfs on /run/snapd/ns/snap-store.mnt type nsfs (rw)
nsfs on /run/snapd/ns/firefox.mnt type nsfs (rw)
nsfs on /run/snapd/ns/gimp.mnt type nsfs (rw)

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

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Title:
  Ubuntu 22.04 snap firefox doesn't save downloads to /mnt subfolders

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