App Tabs disappear when reopening FF - Started in 7.01

When I was updated to 7.01 my app tabs don't persist from one session to the next as they have previously.
Win-7 64-bit - 8GB RAM - Lots of disk space
Tried setting options to start with last tabs, but that didn't affect it.

App (pinned) tabs and Tab Groups (Panorama) are stored as part of the session data [1] in the file sessionstore.js [2] in the Firefox profile folder [3].
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
* [1] http://kb.mozillazine.org/Session_Restore
* [2] http://kb.mozillazine.org/sessionstore.js
* [3] http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox
It is also possible to use the "Show my windows and tabs from last time" setting, that is usually a more reliable way to restore session data.
* [http://kb.mozillazine.org/Menu_differences Firefox/Tools > Options] > General > Startup: "When Firefox Starts": "Show my windows and tabs from last time"
If you use cleanup software like CCleaner then make sure that Session is unchecked in the settings for the Firefox application.

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* http://kb.mozillazine.org/Session_Restore
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Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

App Tabs disappear when reopening FF - Started in 7.01

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