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I'm using Firefox and just tried to save a webp image and it tried to save as a web page. [initially, I said no.. see edit below]

Edit: Looks like it was that specific website and they are doing something odd, so I retract my initial judgement.

Is that server sending the image with the correct mimetype?

Good point! I just went back and checked that specific site, and they are definitely doing something odd. I retract my previous judgement