So blob URLs are auto-revoked by default after the current script stops running. However, every fetch operation in existence (apart from synchronous XMLHttpRequest) does so asynchronous.
So <img>.src = blobURL might very well start fetching at the point blobURL is already cleaned up. We need a different solution here. I'm not really sure what the solution is, but autoRevoke as-is does not work. -- http://annevankesteren.nl/
