Comment 2 for bug 2052666

I'm also affected, the most common one is firefox (but also chromium or vscode).

ls -la /var/lib/snapd/snaps/firefox_*
-rw------- 1 root root 256360448 Jul 3 2023 /var/lib/snapd/snaps/firefox_2800.snap
-rw------- 1 root root 256897024 Jul 9 2023 /var/lib/snapd/snaps/firefox_2880.snap
-rw------- 1 root root 248733696 Aug 2 2023 /var/lib/snapd/snaps/firefox_2952.snap
-rw------- 1 root root 248733696 Aug 25 13:25 /var/lib/snapd/snaps/firefox_3026.snap
-rw------- 1 root root 248418304 Sep 24 11:36 /var/lib/snapd/snaps/firefox_3131.snap
-rw------- 1 root root 252153856 Oct 9 00:42 /var/lib/snapd/snaps/firefox_3206.snap
-rw------- 1 root root 251990016 Nov 20 18:22 /var/lib/snapd/snaps/firefox_3358.snap
-rw------- 1 root root 257859584 Jan 8 23:50 /var/lib/snapd/snaps/firefox_3600.snap
-rw------- 1 root root 257945600 Jan 17 11:35 /var/lib/snapd/snaps/firefox_3626.snap
-rw------- 1 root root 275263488 Jan 25 06:33 /var/lib/snapd/snaps/firefox_3687.snap
-rw------- 1 root root 274821120 Feb 4 07:53 /var/lib/snapd/snaps/firefox_3728.snap
-rw------- 1 root root 275251200 Feb 8 10:43 /var/lib/snapd/snaps/firefox_3779.snap
-rw------- 1 root root 279584768 Feb 21 09:03 /var/lib/snapd/snaps/firefox_3836.snap
snap list --all|grep -i firefox
firefox 121.0.1-1 3626 latest/stable mozilla** disabled
firefox 122.0.1-1 3779 latest/stable mozilla** -

That being said, I suspect this happens when the snap forces an update (as the apps that multiply are the ones that I commonly have 'always open').