I believe cmdnc7p7 to be the current version, and szxl617q to be the old one,

Yesterday I updated Ubuntu to Jammy Jellyfish; this upgrade included replacing Firefox with Firefox-snap. I lost my history, passwords, bookmarks, and the links on my homepage. When I try to import history, Firefox can't find anywhere to import it from. Does anyone know how to restore things, or failing that, how to install a version of Firefox that will allow me to access the files that may still be on my system? Contents of my ~/.mozilla/firefox folder: drwx------ 2 peter peter 4096 Jun 8 2020 cmdnc7p7.default drwx------ 5 peter peter 4096 Aug 25 08:07 'Crash Reports' -rw-rw-r-- 1 peter peter 62 Jun 8 2020 installs.ini drwx------ 2 peter peter 4096 Aug 1 2020 'Pending Pings' -rw-rw-r-- 1 peter peter 259 Jun 8 2020 profiles.ini drwx------ 2 peter peter 4096 Sep 2 14:25 szlx617q.default-release I believe cmdnc7p7 to be the current version, and szxl617q to be the old one, but am clueless beyond that.