I just upgraded to Firefox 10 and all my pinned app tabs disappeared. Not sure how to get them back. This did not happened with any previous upgrades.

Was using Firefox 9 before upgrade.
Note that I was using Tab Utilities 1.1.2 which is now disabled because it is not compatible with Firefox 10 (but this utility does not really deal with app tabs anyway).

Please try this: In Firefox, '''Help''' ('''Alt''' + '''H''') > '''Troubleshooting Information''' > '''Open Containing Folder'''. This opens the [http://kb.mozillazine.org/Profile_folder Firefox Profile Folder]. Copy the '''sessionstore.js''' and '''sessionstore.bak''' files to another place, '''Exit''' Firefox, delete these two files in the profile folder and copy and rename the '''sessionstore.bak''' to '''sessionstore.js''' from the backup to this folder (profile folder). Start Firefox and please also check '''about:sessionrestore'''. Please note that this may not help if the .bak file's size is smaller than the .js.

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