It straighly annoying that ubuntu keep reinvent the wheel with snap, and its not integrated well enough. Im an i3-WM user, and snap applications not listed there dmenu so i must open a terminal, start firefox manually from there. On ubuntu when installing firefox on ubuntu it will ask to install snap

When we search firefox using apt search firefox the result is

firefox/jammy 1:1snap1-0ubuntu2 amd64
  Transitional package - firefox -> firefox snap

If you want to install Firefox with PPA keep following this. First remove firefox snap:

$ sudo snap remove obs-studio

or remove snap altogether:

$ sudo apt remove --purge snapd

I got some error when removing snapd, i just ignoring it.

sudo apt remove --purge snapd
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following packages will be REMOVED:
  snapd*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 
(Reading database ... 324648 files and directories currently installed.)
Purging configuration files for snapd (2.57.4+22.10ubuntu1) ...
Stopping snap-firefox-1919.mount
Stopping unit snap-firefox-1919.mount
Waiting until unit snap-firefox-1919.mount is stopped [attempt 1]
snap-firefox-1919.mount is stopped.
Removing snap firefox and revision 1919
rm: cannot remove '/var/snap/firefox/common/host-hunspell/en_US.dic': Read-only file system
rm: cannot remove '/var/snap/firefox/common/host-hunspell/en_US.aff': Read-only file system
dpkg: error processing package snapd (--purge):
 installed snapd package post-removal script subprocess returned error exit status 1
Errors were encountered while processing:
 snapd
E: Sub-process /usr/bin/dpkg returned an error code (1)

Then we add mozilla PPA repository

 # sudo add-apt-repository ppa:mozillateam/ppa

echo '
Package: *
Pin: release o=LP-PPA-mozillateam
Pin-Priority: 1001
' | sudo tee /etc/apt/preferences.d/mozilla-firefox

Even we prioritize this, somehow on upgrade it still looking for snap version, then there is another tweak to force update via PPA

echo 'Unattended-Upgrade::Allowed-Origins:: "LP-PPA-mozillateam:${distro_codename}";' | sudo tee /etc/apt/apt.conf.d/51unattended-upgrades-firefox

Run apt update, you can see that the firefox will change. apt search firefox | grep firefox:

apt install firefox will get firefox from repo url.

sources:

• omgubuntu
• balintreczey.hu