Thx, I try  application/octet-stream  but nothing happend, data not
send (0 errors on console):

data: "answear=" + canvas.toDataURL("image/jpeg")

Only answear is send. It works as expected only when I use
"application/x-www-form-urlencoded" data are send.

But I saw another problem. I use canvas to read this data. But when I
get data, put on browser and save image I see sth strange: img looks
like the same but not the same. Canvas version is bigger, pixels are
not the same.

Any idea why? How can I save exacly the same img like the source using
JS in Greasemonkey?

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