Mozilla changed the format of session backup files and that means that the previous way of restoring sessions needed updating.

Close the Firefox browser. Make sure no instance of the browser is running. Open the profile folder and rename the current session file sessionstore.jsonlz4 to sessionstore-backup.jsonlz4. Open the sessionstore-backups folder of the profile. Rename recovery.jsonlz4 to recovery-backup.jsonlz4. Rename recovery.backlz4 to recovery-backup.backlz4. Copy the session restore backup that you want to restore, e.g. previous.jsonlz4. Go back to the root directory of the Firefox profile. Paste the copied file to the root folder. Rename it to sessionstore.jsonlz4. Restart the Firefox browser. Firefox might pick up the session automatically. If it does not, press the Alt-key on your keyboard and select History > Restore Previous Session.

Are you saying that your previous session isn't restored or are you looking for the menu command to restore the previous session?

If the former, are you exiting before restarting your computer or shutting down? You should do that and you should use the exit command (either in the menu or the keyboard shortcut). I suggest you also allow enough time for the process to finish before restarting the computer or shutting down.

Are you saying that your previous session isn't restored [Yes, none of the tabs were restored. Also, under the history tab, the “recently closed tabs” were grayed out so that menu command was useless.] or are you looking for the menu command to restore the previous session?

Also, every time I reboot FF or my Computer, none of the previous tabs are restored.

If the former, are you exiting before restarting your computer or shutting down? You should do that and you should use the exit command (either in the menu or the keyboard shortcut). I suggest you also allow enough time for the process to finish before restarting the computer or shutting down.

Can you help me with this? What is the fix for this issue?

Does your Firefox remember other kinds of history from one session to the next? It only loses the last session tabs?

"Firefox might pickup the [previous] session automatically".

This "might" process really does not work.

Every time I create a new session manually, and for whatever reason (out of memory, out of cache, Firefox gets confused, Windows 10 decides to kill the instance), Firefox on my Surface Go does not come back with the recovery & restore pop-up like it does on the PC. When I restart Firefox, it creates a new instance and does not ask for, or provide through the History settings, the ability to restore the previous windows/tabs. It's more than annoying when I was working in multiple tabs.

All the setting are correct for a Restore on Startup. I upgraded to version 107, which was not typically automatic this time (multiple reloads to get it to complete), so maybe it was the prior version which was defective.

Mozilla should be able to create a rollback sequence of windows/tabs to allow a manual restore through the History settings.

Every time I create a new session manually, and for whatever reason (out of memory, out of cache, Firefox gets confused, Windows 10 decides to kill the instance), Firefox on my Surface Go does not come back with the recovery & restore pop-up like it does on the PC. When I restart Firefox, it creates a new instance and does not ask for, or provide through the History settings, the ability to restore the previous windows/tabs. It's more than annoying when I was working in multiple tabs. All the setting are correct for a Restore on Startup. I upgraded to version 107, which was not typically automatic this time (multiple reloads to get it to complete), so maybe it was the prior version which was defective.

Usually Firefox will attempt an automatic crash recovery for a regular (non-private) session. It is possible to make it not-automatic, but then you should have it on the menu. Either:

• "3-bar" menu button > History > Restore Previous Session
• (menu bar) History > Restore Previous Session

If they are missing or grayed, check either:

• "3-bar" menu button > History > Recently Closed Windows
• "Library" toolbar button > History > Recently Closed Windows
• (menu bar) History > Recently Closed Windows

I don't know how the tablet UI changes things.