Users are encouraged to update.
It fixes a few minor and some major vulnerabilities.
Release Notes are available.
You can get Firefox either from the Firefox download page or the Mozilla FTP page, or from the auto-update feature in Firefox, Help>Check for Updates.
Firefox is available for Windows, Mac OS X, and Linux.
For those who do not know what Firefox is, Firefox is Mozilla's open source browser.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.8) Gecko/2009032609 Firefox/3.0.8

