Please care to explain why did you blur the original image? The source you previously had and the other two places where this picture can be found at this resolution (official website and Pixiv account) clearly have a better, unblurred version.

Edit: Disregard that, it appears to be something wrong with Mozilla and how it's loading original images.

I have the same problem, but I'm using Opera... I compared both images, this one and the one from the source. They're actually identical.