Software :: User Agent Switching In Firefox?

I'm trying to watch TV shows off of ABC.com, ABC.com is sending back the following warning:

Code:

Platform not supportedYou appear to be using an unsupported operating system or Web browser. In order to use our video player, we require:Windows XP/Vista with Internet Explorer 6+, Firefox 3
Mac - Firefox 3+, Safari 3+

I think that this is bogus, and I probably need to switch my user agent so that it shows the correct version of firefox, but shows my OS as Windows XP/Vista or Mac. Here is the output of about:config showing all of the user agent strings:

Code:

general.useragent.extra.firefox;Firefox/3.5.7
general.useragent.locale;en-US
general.useragent.security;U

[code]...

As I understand it, these strings get assembled into the user agent header, which looks a little bit like this:

Code:

Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.7) Gecko/20100106 Firefox/3.5.7 I pulled this from Wireshark, after changing the user agent values above... obviously the changes that I'm making in Firefox aren't affecting what's going out over the wire. Right now, I'm in 'press and guess' mode... if someone can give me a better idea of how user agent strings are actually set in Firefox, what the individual values are, I might have a slightly better shot at figuring this out. This is, of course, only the first part of the problem. If ABC is using something proprietary to send out their video, I may still be out of luck...