Firefox snap, how to copy profiles, or parts of profiles, as with .deb firefox packages?

Hi, I very recently upgraded from Ubuntu Mate 20.04 LTS to Mate 22.04 Jammy Jellyfish. Having many various issues including lot’s of apps crashing, hanging or freezing, having the whole screen hanging or freezing I am at a loss. My laptop is working as it should.
I wish to clean reinstall 22.04 from a USB device which I have created already, I have backed up my files and folders, my issue is this, I want to copy the necessary files from the snap version of Firefox profiles of which I have a few to then copy/paste them after reinstalling Mate 22.04 only to find the snap version seems to be set up differently to the .deb version?
Being unsure of myself with snap packages, how do I copy files from profiles in the snap version of firefox to then paste them back into snap firefox after reinstalling Ubuntu Mate 22.04?

Hi don't use the snap but the tarball. BTW it works great have no snaps at all.

Maybe here:

Profile should be located in the snap directory. In my case, that's /home/duck/snap/firefox/common/.mozilla/firefox


Thanks ciba43, your input is very much appreciated!
Best wishes,

Thanks for your input mendy, I appreciate all the help I can get.
Kind regards,