AppTabs don't open when I start Firefox

I pinned a couple of tabs as App tabs. When I closed Firefox and re-opened they did not re-open as is described in their description page.

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.

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    # "'''Restore Recently Closed Windows'''" -- can choose which window to reopen based on name and the mouse-over tells how many tabs. or you just use "'''Restore All Windows'''" without the guessing.
    ''I know you are on a Mac, and this affects Windows user more than anybody else, but it does affect other systems besides Windows, occasionally, perhaps more often now with the plugins container.''
    The following may not completely eliminate having to terminate Firefox through the Windows Control Panel but it will come very close.
    '''Plug-in and tasks started by Firefox may continue after attempting
    to close Firefox''' The "X" in the upper right-hand corner closes the
    Window (same as Ctrl+Shift+W) but even if it is the last Firefox window,
    it does not necessarily close Firefox .
    The only '''proper way to exit Firefox''' is to use '''Exit''' through the
    File menu, not the "X" in the upper right corner of last Firefox window.
    In the Firefox 4 and 5 that would be Alt+F then X
    * '''Firefox hangs''' | Troubleshooting | Firefox Support <br>http://support.mozilla.com/en-US/kb/Firefox%20hangs#w_hang-at-exit
    Use the '''Windows Task Manger''' to remove all running firefox.exe in the "'''Processes'''" tab of the Windows Task Manager, then restart Firefox.
    If Firefox will still not start, remove the parent.lock file from the profile which is created each time Firefox is started to prevent other Firefox tasks from running, see<br>
    http://kb.mozillazine.org/Profile_in_use#Remove_the_profile_lock_file
    '''Avoiding Problems with close/restart''' ''choose either extension''
    :Use to close and restart Firefox after enabling or disabling an extension, switching to a new theme, or modifying configuration files, then you don't have to worry about delay or have to look in the Task Manager to see if Firefox is closed yet.
    Both extensions use the same keyboard shortcut "'''Ctrl+Alt+R'''" or a file menu option.
    *"'''Restartless Restart'''" extension for Firefox 4.0+ only (2 KB download ) <br>https://addons.mozilla.org/firefox/addon/249342/
    *For older versions use "'''QuickRestart'''" extension (34 KB download) (<br>https://addons.mozilla.org/firefox/addon/3559/

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