As part of a series of "street-smart books on technology," this volume is for Mac, Windows, and Linux users looking for open-source Internet alternatives. Hofmann (with the Mozilla Foundation, formerly at Netscape) introduces the standard and cool features of the Firefox browser and the Thunderbird e-mail program. He includes websites "to waste your time with" and a glossary of tech terms. Hofmann's co-authors include Marcia Knous and John Hedtke