Just friendly remainder to all Firefox 1.5.0.5 is available for download.
This release of Firefox fixes 12 security holes including ability to execute malicious code. Therefore, you must upgrade your FireFox version. See the list of vulnerabilities fixed in this version
You can see live demo of one of such execute malicious code security hole here (it may crash your browser).
Firefox download link.
On a related note Thunderbird 2.0 Alpha 1 is available for download.
