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http://dev.w3.org/2006/webapi/FileAPI/#validBlob states: > a valid blob argument, which is a non-null Blob in scope of the > global object's URL property from which this static method is called I have no idea what that means. The one thing I could imagine—that the methods should not work for Blobs created in another global scope—is not implemented by either Gecko or Chrome, and I don't see why it would. Also note that neither method takes a nullable blob, so "non-null" is pointless at best.
*** Bug 24573 has been marked as a duplicate of this bug. ***
Fixed; this concept doesn't exist anymore, but closed blobs have been defined more clearly.