Firefox 3 was only released on Tuesday, and a security vulnerability has already been found. In fact, the vulnerability was found within the first five hours of its release at 10 AM PDT.

You may recall that the Mozilla Foundation is trying to set a Guinness World Record: the most downloads of software in the first 24 hours of its release. But we had no release date and we received an RC3 on Wednesday.

Release Candidate 2 of Firefox 3.0 has appeared on Mozilla's FTP servers. You'll recall that last week, Mozilla decided that it needed a second RC in order to address bugs found in the RC1 build.

One of the strengths of Firefox has been its large assortment of extensions, plug-ins and language packs, which extend its functionality in any number of ways. Internet Explorer has nowhere near the number or variety of add-ons. Of course, if one of them gets compromised.

Mozilla has started to develop the Firefox web browser for mobile devices. Mike Schroepfer, Mozilla's vice president of engineering said not to expect instant results, and that Firefox won't arrive until later, 'certainly not before 2008'.