all the information i have is contained in one line. Set up app tabs close fire fox and then reopen. i do nothing between these 2 tasks. Did this 5 times and it still does not work
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In case you are using "Clear history when Firefox closes":
Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.
as i stated in my original message i did nothing but set up the tabs close FF, reopen it and tabs are gone. History is set to clear in 24 hours. My operation took about 24 seconds
You can check for problems with the files sessionstore.js and sessionstore.bak 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, so you will have to create them again (make a note or bookmark them).