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See https://bugzilla.mozilla.org/show_bug.cgi?id=752402
From the Mozilla bug referenced above, it seems that IE10 *and* Firefox support an overloaded constructor with ArrayBuffer. I suppose that's a sufficiently strong arm tactic to get the spec. to change :)
Done. I'm marking this fixed. http://dev.w3.org/2006/webapi/FileAPI/#dfn-Blob
https://dvcs.w3.org/hg/webapps/rev/4e19fa431f24