Does this site hate the Firefox browser?

I just had a very interesting experience.  I inititally came to this site using Firefox on my Linux computer.  When I tried to create an account I got the following page:

http://store.altenergystore.com/cookie_usage/

For the record, cookies ARE enabled.  So I went to my Windows computer, again with Firefox.  Same page.  I then went into the settings and told Firefox to act more like IE.  Lo and behold, I am able to sign up.  I then went BACK to the Linux computer, where I am now, and obviously I now have the ability to post on a computer that your site complained about before.  How's that for gits and shiggles?

Of course, one has to wonder about the value of a website that forces one to use Internet Exploder, even for a short time.  Microsoft is like DRM, everybody hates it, but nobody is willing to learn how to live without it.