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→Building Firefox
http://www.microsoft.com/express/download/
If you paid for the Professional version of Visual Studio you can skip this step. But if you are using an express version, you need to install the Windows Server 2003 Platform SDK in order to get some headers (atlbase.h to be specific) included in the Professional version:
http://www.microsoft.com/downloads/details.aspx?FamilyId=0BAF2B35-C656-4969-ACE8-E4C0C0716ADB&displaylang=en
You should have [http://developer.apple.com/TOOLS/Xcode/ Xcode] installed. You don't need to use Xcode for editing source files, but you will need the developer SDK that comes with it.
In order to build Firefox you will need something called MacPorts which can be dowloaded downloaded from here:
http://www.macports.org/install.php