r3dfox is release branch Firefox made to work on Windows 7/8. Also with limited compatibility for XP using OCAPI and Vista using the extended kernel.
Main download: https://github.com/Eclipse-Community/r3dfox/releases
Alternative download: https://sourceforge.net/projects/r3dfox/files/
If you run into any bugs or issues, please report it on GitHub under the issues tab. I am more likely to get to it and remember to fix it if it's there. If you don't have a GitHub account, here is fine too.