Now someone created a MSI-installer for Firefox 1.0PR (0.10.1). I didn't test it, but seems to work for most people. See more info and download links in this topic on MozillaZine: http://forums.mozillazine.org/viewtopic.php?t=138033 Direct download: http://www.frontmotion.com/Firefox/FireFox-0.10.1PR-enUS.msi