A test version of <A HREF="http://www.eweek.com/article2/0,1895,1881070,00.asp">a new Firefox browser</A> is now available. New features include improved pop-up advertisement blocking and faster back and forward Web navigation features, and added support for Mac OS X. The new release comes at a time when the Firefox browser is gaining more share of the browser market, and thereby proving its mettle against Microsoft and other deep-pocketed competitors and their proprietary Internet browsers.