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updated to 23.0.1 now I have 16 blank 'new tabs' instead of my 16 saved tabs.

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Updated Firefox this morning, then restarted my computer. Now my tabs are gone, my groups are gone, my pinned tabs are gone. Session Manager shows that my sessions are there but will not restore last session or previous to last. (Using tab mix plus session manager.)

Restore previous session under History brings up a choice of the last web pages I visited, not the pages that I had in my tabs.

Updated Firefox this morning, then restarted my computer. Now my tabs are gone, my groups are gone, my pinned tabs are gone. Session Manager shows that my sessions are there but will not restore last session or previous to last. (Using tab mix plus session manager.) Restore previous session under History brings up a choice of the last web pages I visited, not the pages that I had in my tabs.

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You can check for problems with the sessionstore.js and sessionstore.bak files in the Firefox profile folder that store session data.

Delete the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox profile folder.

Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost and you will have to recreate them (make a note or bookmark them if possible).