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Firefox is a free web browser available for Windows, Mac, and Linux. It has many features that other browsers don't, including pop-up blocking and tabbed browsing. Consider [http://www.mozilla.org downloading Firefox] if you don't already have it. If you have a Mac, also consider getting [http://www.caminobrowser.org/ Camino], a truly Mac OS X native browser using the Gecko engine (the same thing that's inside Firefox). It doesn't have all the extensions available that Firefox does, but it's more Mac-friendly and really a beautifully simple browser. For some extra features, check out [http://www.nada.de/mac/camitools/ CamiTools], a set of extensions for Camino.