Why does Firefox get rid of my app tabs every time I close it?

I make app tabs when I open Firefox, then I close it later. Then the next time I open Firefox, the app tabs are gone.

App (pinned) tabs and Tab Groups (Panorama) are stored as part of the session data in the file sessionstore.js in the Firefox profile folder.
* http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox
* http://kb.mozillazine.org/sessionstore.js
* http://kb.mozillazine.org/Session_Restore
Make sure that you do not use [[Clear Recent History]] to clear the "Browsing History" when Firefox is closed because that prevails and prevents Firefox from opening tabs from the previous session.
* https://support.mozilla.com/kb/Clear+Recent+History

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