Firefox 18.0.2 was sent to the release channel today by Mozilla. Although this update does not include any security updates, the massive list of bug fixes suggests that it is advisable to install this update sooner rather than later.
What's New and additional information is available in my blog post at Mozilla Firefox 18.0.1 Release Includes Massive Bug Fixes (http://securitygarden.blogspot.com/2013/02/mozilla-firefox-1801-release-includes.html).
Note: The update to version 18.0.2 added a check to the allow 3rd party cookies. If you, like me, do not want to accept 3rd party cookies, you can reverse the change at Firefox > Options > Privacy.