We strongly recommend that all Firefox users upgrade to this latest
release. If you already have Firefox 3 or Firefox 2, you will receive
an automated update notification within 24 to 48 hours. This update
can also be applied manually by selecting “Check for Updates…” from
the Help menu.
For a list of changes and more information, please review the Firefox
3.0.3 Release Notes at http://www.mozilla.com/firefox/3.0.3/releasenotes/