How can I set Firefox Proxy settings and exclusions via Active Directory Group Policy?

The title says it all really.
We use a proxy server for our internet access but we also have some serves on site which have browser-accessible features and the proxy server needs to be bypassed for these addresses.
I know where to set this manually but we have hundreds of employees and I don't want to set this manually for each one.
For Internet Explorer I can use Active Directory Group Policy to push the settings out.  However, this doesn't work for Firefox.
Is there a way of doing it via a GP addon or a script?
For information:
Server environment is Windows Server 2003 and clients are Windows XP.
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Chris DentPowerShell DeveloperCommented:

Not an easy one, but there's always this:

Otherwise you may consider using Web Proxy Auto Discovery (WPAD).


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UncleBubbaAuthor Commented:
I found this unsuitable for my needs but the solution did pretty much precisely answer my question, so thanks.
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