I thought it was just me, or perhaps, a rather unusual personal style.
I normally use Firefox; tried on Chrome, as suggested above; there they look quite normal.
Strange; I've not noticed this elsewhere.
Scott's photos are posted as JPEGs but with Capture One's "GenericDngFile-Neutral" color calibration; they have that color profile attached. Safari and Chrome browsers are color-managed and honor the color calibration profile, thus presenting the images correctly. Firefox by default is NOT color-managed and is interpreting the colors as if the files were calibrated to sRGB, ignoring the profile.
I believe there is some way to turn on color-management in Firefox, but I'm not a big Firefox user and don't know what it is.
Regardless, the GenericDngFile-Neutral color calibration profile is an input device profile, not a display device profile, and is essentially a Lab colorspace transform on the DNG raw data. It's not intended to be used with 8-bit RGB data for distribution and presentation on the web.
Scott should convert his photos from GenericDngFile-Neutral to sRGB (current standard is sRGB IEC61966-2.1, (c)1998 HP, this is the standard used by Adobe and nearly everyone else) before exporting them to be posted on-line. They they'll work beautifully in Firefox as well any other non-color-managed or color-managed web browser.
G