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2 results for "SSTabClosing":
Session store API - Archive of obsolete content
ArchiveAdd-onsSession store API
firefox 3 note in firefox 3 and later, if you need to detect when a tab is about to be closed so that you can update data associated with the tab before it is closed, you can watch for the "sstabclosing" event, which is sent to the tab.
Event reference
WebEvents
sstabclosing addons specific the session store will stop tracking this tab.