StopBadware was[1] an anti-malware nonprofit organization focused on making the Web safer through the prevention, mitigation, and remediation of badware websites.

[1] The founders of StopBadware.org were John Palfrey, then Executive Director of the Berkman Center, and Jonathan Zittrain, then at the Oxford Internet Institute.

[5] Google, GFI Software, and NSFocus participate as data providers in the organization's Badware Website Clearinghouse (see below).

[6] In June 2012 StopBadware launched the Ads Integrity Alliance with support from founding members AOL, Facebook, Google, the Interactive Advertising Bureau (IAB), and Twitter.

StopBadware also aggregated badware statistics,[12] advocates for consumer protection in public policy, and publishes advisory documents (software guidelines,[13] best practices for web hosting providers[14]) compiled with input from the organization's working groups.

StopBadware investigated reports of improper behavior by programs, and offered vendors the opportunity to reply to their findings.

StopBadware focused on web-based malware and defined badware as "software that fundamentally disregards a user's choice about how his or her computer or network connection will be used."

The Firefox web browser and other applications also use Google's Safe Browsing API to warn their users based on the same blacklist.