Problems PHP4, IIS and Firefox

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I'm a complete and utter newbie when it comes to PHP so likely I'm missing
something daft.

I've downloaded the PHP4.3.10 win32 installer and run it and have a sample
php page. In IE it runs fine and produces the expected result but Firefox
tries to download the php file itself instead. Can anyone shed some light on
what is going wrong?

php files on internet sites work fine so I assume I've set IIS up


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