With the release Firefox 3.0 alpha 8, the Mozilla Corporation has finally unveiled several security features it's talked up for months. The malware blocker will block Web sites thought to contain malicious downloads. The feature will use information provided by Google Incorporated to flag potentially-dangerous sites, warn anyone trying to reach those URLs with Firefox and automatically block access to the site.

Another new feature prevents automatic updates of extensions from sending users to malicious sites where they might be infected by attack code or drive-by downloads.