As far as I see in the ongoing development for 22.04 Jammy, Firefox is a Snap package.
The related Deb package in apt is just a shortcut/link to the that snap version.
I prefer my installation not to be from snap packages, since I find them too much 'Ubuntu-specific'.
Are there alternative ways to install Firefox on Jammy?
My favourite option would be an Apt repository or PPA. I will test the Flatpak version with my test virtual machine in the meantime.
Best Answer
If you switch to the APT version, you will lose the bookmarks in the snap version unless you sync them with your Firefox account, or export them manually.
The other answer by Organic Marble is for Firefox-ESR, and the answer by eddygeek is for the beta version.
This answer is for the latest stable version of Firefox. You can use the Firefox PPA maintained by Mozilla team.
Then, copy and paste the following code in a terminal in one go (don't copy-paste line by line) to prioritize the apt version of firefox over the snap version.
Next, remove the snap version of firefox
If you see the following error,
Then run the following commands (source) to disable the hunspell service, and try removing Firefox snap once again.
Install Firefox with apt.
To ensure that unattended upgrades do not reinstall the snap version of Firefox, enter the following command. Alternatively, you can turn off unattended upgrades.
To undo these changes
Source: OMG Ubuntu