A security update for Mozilla Firefox 3 has been released that fixes critical security vulnerabilities. All users should update to Firefox 3.0.7 as soon as possible. By default, Firefox 3 should automatically notify the user of new updates.
More information
Release notes on Firefox 3.0.7 - http://www.mozilla.com/en-US/firefox/3.0.7/releasenotes/
Updating Firefox - http://support.mozilla.com/en-US/kb/Updating+Firefox
Finding your Firefox version - http://support.mozilla.com/en-US/kb/Finding+your+Firefox+version
List of vulnerabilities
MFSA 2009-11 URL spoofing with invisible control characters [Low]
MFSA 2009-10 Upgrade PNG library to fix memory safety hazards [Critical]
MFSA 2009-09 XML data theft via RDFXMLDataSource and cross-domain redirect [High]
MFSA 2009-08 Mozilla Firefox XUL Linked Clones Double Free Vulnerability [Critical]
MFSA 2009-07 Crashes with evidence of memory corruption (rv:1.9.0.7) [Critical]
