The image file is set to Adobe RGB(1998). Should be in sRGB for web compliancy.
My Firefox is colourspace-aware and usually displays aRGB nicely, but not this one. Or to be correct, even viewed inside Photoshop as Adobe RGB, the colours look dull and flat as we have seen so many times before with Zeiss lenses. In fact, the Photoshop and Firefox renditions are as similar as they possible can get.
Maybe a polariser was used? That can wreak havoc with colour brilliancy.