On Tuesday, November 8, Mozilla released version 8.0 of Firefox and Thunderbird. Details of what is included in the new release are available from the following URL – http://www.mozilla.org/en-US/firefox/8.0/releasenotes/
Additionally, several security vulnerabilities were addressed with the release of Firefox 8.0 and also Thunderbird. Please see the following URLs for details.
Firefox – http://www.mozilla.org/security/known-vulnerabilities/firefox.html#firefox8
Thunderbird – http://www.mozilla.org/security/known-vulnerabilities/thunderbird.html#thunderbird8