(In reply to Gingerbread Man from comment #1) > > Set image.webp.enabled to false. > > That just controls whether the browser will display such images. The server will still try to serve you such files based on the Accept header; it's just that you'll get a download prompt because Firefox won't show the image. If Firefox won't show webp images, it should not offfer image/webp in the Accept header. I concur with Honza.
Bug 1615844 Comment 3 Edit History
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(In reply to Gingerbread Man from comment #1) > > Set image.webp.enabled to false. > > That just controls whether the browser will display such images. The server will still try to serve you such files based on the Accept header; it's just that you'll get a download prompt because Firefox won't show the image. If Firefox won't show webp images, it should not offer image/webp in the Accept header. I concur with Honza.