The browser wars continue to rage with Microsoft, Mozilla, Google and others all keen to have us use their products, and theirs alone, to access the wonders of the Worldwide Web. New versions are appearing thick and fast with, in March this year, two significant new releases-the first from Microsoft with Internet Explorer 9 (IE9) closely followed by Firefox 4 from Mozilla a mere week later. We've already reviewed IE9, now it's the turn of Firefox, with a look at just what version 4 of the Mozilla browser has to offer.