Explicitly terminating worker with blocked setVersion call should allow later open calls to proceed On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". indexedDB = self.indexedDB || self.webkitIndexedDB || self.mozIndexedDB || self.msIndexedDB || self.OIndexedDB; request = indexedDB.open("pending-version-change-stuck-works-with-terminate.html") PASS Open worked after page reload. PASS successfullyParsed is true TEST COMPLETE