A new version of Firefox was released yesterday: 14.0.1. You can download the new version from the Mozilla site.
This new version contains fixes for several security vulnerabilities, as outlined on the Firefox security advisories page.
The new version also sports several new features, including secure search, which changes the search bar to use secure searching if available. This follows Google’s recent change to use secure search by default for users logged in to Google. Secure browsing is now shown by a lock icon at the far left of the address bar, which replaces the favicon previously shown there.
The official release announcement for version 14.0.1 contains all the details.