Mozilla has released Firefox 3.6.9 [1], updating the popular Web browser with support for the X-FRAME-OPTIONS [2] HTTP response header that enables Web site owners to prevent their content from being embedded in other sites, which can lead to clickjacking [3] attacks. The update also addresses a number of security vulnerabilities and bugs, some of which could result in crashes. (Free, 19 MB)
[1]: http://www.mozilla.com/
[2]: http://blog.mozilla.com/security/2010/09/08/x-frame-options/
[3]: http://en.wikipedia.org/wiki/Clickjacking