Can't view site in Firefox 3.6.20

I’m having some trouble getting this website to show up in Firefox 3.6.20.
It’s only showing the background image, and nothing else.
Here is a link to the site:
https://animalnature.net

And here is a screen shot from the browser:
https://dl.dropbox.com/u/3531062/firefox_screenshot.png

Seems to be fine in all other browsers and browser versions.

Thanks for any help you can provide!