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- Download the latest [http://ftp.mozilla.org/pub/mozilla.org/mozilla/libraries/win32/MozillaBuildSetup-Latest.exe MozillaBuild package]. This package contains other software that will be needed to successfully build Firefox.
- Download the source code for the release version you would like to build. In this case, I downloaded the source for [ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/4.0b9/source/ Firefox 4.0b9]