I've always used Opera. However there are still some pages that don't display properly.And it seems to use more memory than Firefox, but i'm not 100% sure. The pages that are not displayed properly both in FF and Op are probably pages that were written by some idiots using non-standard microsoft propietary code..    As a web designer/programmer I've checked web pages with the 3 major browsers (FF, IE, Op) and FF and Op are the more standard ones, in most cases they render the pages the same way since they both use the W3C standards, IE doesn't do this...    Even if you need to render a page using IE in most cases you won't need to leave FF to do so, you can install an add-on called IE tab for FF that let's you use the IE engine to render a page within FF :clink