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Per the '[IndexedDB] A "versionchangeblocked" event' thread [1], we should create a new IDBRequest derivative that has an onblocked event. This derivative would be returned by setVersion. onblocked would be fired if setVersion is blocked on another window with an open database connection. This would allow sites to inform the user of the problem [1] http://lists.w3.org/Archives/Public/public-webapps/2010JulSep/1029.html
*** Bug 10766 has been marked as a duplicate of this bug. ***
Fixed by http://dvcs.w3.org/hg/IndexedDB/rev/26e7d99ab935 It's a quite complicated checkin so please do check that things look good.