Now since this Update Pack Addon isn't developed anymore, then i will post a little tip here for everyone which dosen't allready know about it :
Instead of using an extension just for the single purposse of passing WGA checks with Firefox, then instead use the 'IE Tab' extension. It uses IE's rendering engine to display pages with in Firefox, whenever you click on the little 'IE Tab' icon in the systray, or you can set it up to always render specific URL's automatically through IE's rendering engine and you can use '*' in the address, so that you can e.g. make all Microsoft sites be auto-rendered through IE's engine.
So with this single extension, then you can pass WGA checks with Firefox, use Windows/Microsoft Update with Firefox and also render all other IE-only pages perfectly with Firefox
This extension will of course also need KB892130(WGA validation) to be installed for passing WGA checks, but if you don't allready have it, or have an outdated version of it, then you will be prompted to get it downloaded and installed automatically at the very first WGA check you try to pass.
IE Tab :
http://ietab.mozdev.org/
v1.5.723.1
