Public bug reported:

Firefox running within snap confinement is unable to use the pinch to
zoom gesture on 22.04. This is a regression as it does work on 21.10. I
had been following https://bugs.launchpad.net/bugs/1964541 as it was
suspected that these two issues were linked, however I am using the
updated mutter released as a fix for the drag and drop bug but this
didn't result in a fix for pinch to zoom. Pinch to zoom does work when
using Firefox from the official tarball with the variable
MOZ_ENABLE_WAYLAND=1 set.

Originally reported on the snapcraft
forum:https://forum.snapcraft.io/t/firefox-pinch-to-zoom-not-working-
on-22-04/29391

Screen recording attached showing pinch to zoom not working on snap
firefox and comparing with the gesture working on mozilla tarball
firefox with libinput debug-gui showing the pinch gesture

Description:    Ubuntu Jammy Jellyfish (development branch)
Release:        22.04

$ snap info firefox 
name:      firefox
summary:   Mozilla Firefox web browser
publisher: Mozilla✓
store-url: https://snapcraft.io/firefox
contact:   
https://support.mozilla.org/kb/file-bug-report-or-feature-request-mozilla
license:   unset
description: |
  Firefox is a powerful, extensible web browser with support for modern web
  application technologies.
commands:
  - firefox
snap-id:      3wdHCAVyZEmYsCMFDE9qt92UV8rC8Wdk
tracking:     latest/beta
refresh-date: 2 days ago, at 18:06 BST
channels:
  latest/stable:    99.0.1-1    2022-04-13 (1232) 163MB -
  latest/candidate: 99.0.1-1    2022-04-12 (1232) 163MB -
  latest/beta:      100.0b6-1   2022-04-15 (1244) 163MB -
  latest/edge:      101.0a1     2022-04-15 (1243) 180MB -
  esr/stable:       91.8.0esr-1 2022-04-05 (1184) 161MB -
  esr/candidate:    91.8.0esr-1 2022-03-30 (1184) 161MB -
  esr/beta:         ↑                                   
  esr/edge:         ↑                                   
installed:          100.0b5-1              (1236) 163MB -

mutter:
  Installed: (none)
  Candidate: 42.0-3ubuntu2
  Version table:
     42.0-3ubuntu2 500
        500 http://gb.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages

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

** Attachment added: "firefox-pinch-to-zoom.webm"
   
https://bugs.launchpad.net/bugs/1969220/+attachment/5580953/+files/firefox-pinch-to-zoom.webm

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https://bugs.launchpad.net/bugs/1969220

Title:
  Pinch to zoom not working on Wayland on Jammy

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