Here's another image with EXIF-orientation that can be used to test this bug, BTW (this one's a photo so it's easier to immediately see whether it's rotated in a broken way or not). (Taken from http://sethfowler.org/blog/2013/09/13/new-in-firefox-26-css-image-orientation/ )
Bug 1634180 Comment 6 Edit History
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Here's another image with EXIF-rotation that can be used to test this bug, BTW (this one's a photo so it's easier to immediately see whether it's rotated in a broken way or not). (Taken from http://sethfowler.org/blog/2013/09/13/new-in-firefox-26-css-image-orientation/ )