http://releases.mozilla.org/pub/mozilla.org/firefox/releases/2.0b2/contrib/firefox-2.0b2.en-US.os2.zip
Firefox is a stand-alone browser, based on Mozilla code.
http://www.mozilla.com/firefox/
Note that current builds require an updated version of ipluginw.dll for Java support; see the Warpzilla tips page for more information.
http://www.os2bbs.com/os2news/Warpzilla.html
Source: OS2.jp