Sorry, I've just spotted a couple of typos in my post above:

The Local Directory show in about:profiles exists and opens normally with the Open Directory button.

If I search for no9r1iq5.default-release-1681391696978 in the file manager, I see that there are two folders with this name, one at the Local Directory path shown above and the other at: /home/username/.var/app/org.mozilla.firefox/.mozilla/firefox My assumption is that this is actually the Root Folder (it contains files with today's date)

My question is, why does about:profiles show the wrong path for the Root Directory or why is the actual Root Directory in the wrong place (it appears that the path shown in about:profiles is the normal default location)?

I tried creating a new profile and it was created in exactly the same way: the Root directory path is: /home/username/.var/app/org.mozilla.firefox/.mozilla/firefox but about:profiles says it is: /home/username/.mozilla/firefox

sorry about that, I think I'm a bit too tired for this!

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Could be that the Firefox version you use, created its profile in another location similar to what Snap versions do.

You can try Firefox from the official Mozilla server if you currently use a version from the repositories of your Linux distribution to see if it behaves differently.

• https://www.mozilla.org/en-US/firefox/all/#product-desktop-release

It probably has something to do with the way the flatpak sandbox works, the snap package manages to show the correct Root path in about:profiles. Regardless, you can bind mount your profile folder so it appears in the expected place for flatpak profiles:

mount --bind /home/<user>/.mozilla/firefox/<profile>  /home/<user>/.var/app/org.mozilla.firefox/.mozilla/firefox/<profile>

Thank you everyone, that's all really helpful. I'm now sure that the issues is caused by the way flatpak sandboxes the app files. The suggestion to bind mount the folders is really neat. It should solve the problem of about:profiles having the wrong path.