I've noticed that there is already one issue open to request that: 
https://github.com/greasemonkey/greasemonkey/issues/1834
Just no replies.

Should I open a new one/write in that one?

On Tuesday, February 11, 2014 9:26:47 PM UTC+1, Kabir Sala wrote:
>
> Hi,
> I need to fetch an image from the web (any site), and then store it 
> locally in a Blob.
> I can do this using xmlhttpRequest, by setting the responseType to "blob". 
> But as the images I have to download aren't on the same domain, I need to 
> use GM_xmlhttprequest (for CORS).
>
> But GM_xmlhttprequest doesn't support the responseType, so the resulting 
> Blob is not valid.
>
> I've tried searching on Google, the most common suggestion it's to set 
> "text/plain; charset=x-user-defined" as the mime type and then do some 
> local processing, but it doesn't work (at least in my  case). It's also an 
> "hacky" solution, as the javascript code has to read every byte from the 
> request.
>
> So my question is, there is a good alternative? Or even just a working one?
> Or there is any plan to support responseType within GM_xmlhttprequest?
>

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