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Why, when I post my tabs with "Pin as App tab", do they disappear whenever I shut down??

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When I use the "Pin as App Tab" feature, the tabs DO appear as icons, but they disappear every time that I shut down and re-start. What am I doing wrong??

When I use the "Pin as App Tab" feature, the tabs DO appear as icons, but they disappear every time that I shut down and re-start. What am I doing wrong??

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App tabs and Tab Groups (Panorama) are stored as part of the session data in the file sessionstore.js in the Firefox Profile Folder

Make sure that you do not use Delete browsing, search and download history on Firefox to clear the "Browsing History" when Firefox is closed because that prevails and prevents Firefox from opening tabs from the previous session.

If you use CCleaner then make sure that Session is unchecked in the settings for the Firefox application.

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Thank you. I believe that this has solved the problem. David Smith Peterborough, Ontario, Canada