A similar thing just happened to me as well. In my case I noticed a new ~/.purism/firefox folder was created when I started Purebrowser. I was able to get my old settings by moving it out of the way and pointing it to my old purebrowser directory:
mv ~/.purism/firefox ~/.purism/firefox.bak
ln -s ~/.purism/purebrowser ~/.purism/firefox
Then when I started Purebrowser again my restored tab session came back.
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