Comment: It's a transparent gif and FF now uses a shadowbox style tab to

(See in situ)

In reply to comment: Strange, when using Firefox (see in situ)

It's a transparent gif and FF now uses a shadowbox style tab to

display stand-alone images that has a dark grey background.

Why the creator made it as a transparent gif I have no idea. There's not much point to doing so.

If you save the file, open it in GIMP or some other image editor and save it as a JPEG or PNG without transparency, (or change the transparent background to white) then it will look normal.

Any webkit browser should display this correctly as well. (chrome, safari)