If you have not upgraded to Firefox 2 yet, then there is a security alert that you should pay attention to. Here is the inside information.
As part of Mozilla Corporation’s ongoing stability and security update process, Firefox 18.104.22.168 is now available for Windows, Mac, and Linux for free download from mozilla.com (http://www.mozilla.com/en-US/firefox/all-older.html). We strongly recommend that all Firefox 1.5.x users upgrade to this latest release. This update is available immediately in 37 languages including German, French, Spanish, Japanese, Simplified and Traditional Chinese, Korean, and more.
Note: Firefox 1.5.0.x will be maintained with security and stability updates until April 24, 2007. All users are strongly encouraged to upgrade to Firefox 2 (http://www.getfirefox.com).