Please see here for a freely downloadable MSI package of Firefox 1.0.4:

http://www.zettaserve.com/zpackager/zpackager_welcome.asp

Features of this package include:

- Free of all Windows Installer ICE Validation Errors.
- Fully supported under many corporate Microsoft Windows based software package deployment solutions including Microsoft Active Directory, Microsoft SMS, Novell ZENworks and Altiris.
- Allows deployment to non-Administrative users providing usability on typical "managed" (locked-down) environments.
- Allows unattended installation. Silent. No user intervention is required.
- Full upgrade support for previous Firefox MSI packages (no need to uninstall old versions first).