From Virtual World Computing:
Cocoon is an all-in-one plugin that makes everything you do online private, secure and virus-free. Without Cocoon, websites have access to your computer to leave cookies or infect it with viruses and malware. Cocoon even makes open WiFi access points secure. Features: Truly anonymous browsing; Anti-virus protection; Cookies stored off your computer; Secure connection on public wifi; Privacy on shared computers; Encrypted browsing history; Anonymous email creation; Blocks drive-by malware attacks; History access on multiple devices; Secure webmail access. Free account must be created and activated at the getcocoon.com/signup to use the Cocoon service.
What's new in this version:
Version 1.18c adds support for Firefox 12, Memory management improvements and improved client performance, improved login speed & reliability on high-latency networks
and Improved form filling
Improved logout process.