Firefox is not shown as opened in the dock on 22.04

This is a screenshot of my dock bar on the left in Ubuntu 22.04:

There is a small green arrow on the left of the "Files" application because a nautilus window is actually opened.

But no such arrow is present nearby the Firefox icon, even so I do have a Firefox window which is opened. So, if I click on that icon, it tries to open a new Firefox window (without any success), where it should show up my already opened windows (which it actually doesn't).

Is there anything I can do to fix this? It seems to only happen with Firefox.

Info:

$ lsb_release -aNo LSB modules are available.Distributor ID: UbuntuDescription:    Ubuntu 22.04 LTSRelease:    22.04Codename:   jammy$ gnome-shell --versionGNOME Shell 42.0$ echo $XDG_SESSION_TYPEwayland$ uname -mor5.15.0-25-generic x86_64 GNU/Linux

More:

$ sudo apt-cache policy firefoxfirefox:  Installed: 1:1snap1-0ubuntu2  Candidate: 1:1snap1-0ubuntu2  Version table: *** 1:1snap1-0ubuntu2 500        500 http://ch.archive.ubuntu.com/ubuntu jammy/main amd64 Packages        100 /var/lib/dpkg/status