How-to: Minefield/Firefox beta 8

This is how I just was able to use Firefox beta 8 (aka minefield).

Having Portable Firefox 4 beta 6 already installed, I went here:
http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-trunk/

and downloaded:

firefox-4.0b8pre.en-US.win32.zip

Then I replaced the firefox old Firefox folder with the extracted firefox folder here:

\PortableApps\FirefoxPortableTest\App

then run this:

\PortableApps\FirefoxPortableTest\FirefoxPortable.exe

and you now have bleeding edge Firefox, with all the bugs it contains.... it is fast though.

Im sure there are issues and no-nos with installing it this way and someone will certainly inform me... so fire away.