- Multi-Channel Chat: You now can enjoy real time conversation with your contacts, right from your favorite messaging application.
- Do Not Track: This option has been implemented as an addition to Search the Web.
- Ubuntu One is now supported in Filelink - the option to upload large attachments to online storage services.
- New User Interface: Thunderbird is replicating the new look and feel of Mozilla Firefox in an effort to provide a similar user experience across all Mozilla software desktop or mobile and all platforms.
- Various fixes and performance improvements
- Various security fixes