http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/1.0rc1/contrib/firefox-1.0rc1.en-US.os2.zip
"The Firefox Preview Release empowers you to browse faster, more safely, and more efficiently than with any other browser. Join more than 6 million others and make the switch todayùFirefox imports your Favorites, settings and other information, so you have nothing to lose."
Source: OS2.jp