Just a quick note - Mozilla released Firefox 3.5.7 and 3.0.17 yesterday. Having looked through the patch list, it doesn't appear that there are any security issues though there are some stability fixes added.

Details can be found here:

Firefox 3.5.7: http://www.mozilla.com/firefox/3.5.7/releasenotes/
Firefox 3.0.17: http://www.mozilla.com/firefox/3.0.17/releasenotes/