Firefox 1.0.2 is a proactive update to fix a bug that makes users vulnerable to a buffer overflow in GIF image processing. We don't know of any exploits in the wild that take advantage of this bug, but the Mozilla Foundation, and all of the mozilla.org projects, take security very seriously, so we're happy to be able to provide rapid turnaround on issues like this.
We've worked hard to build a reputation for delivering secure products. That reputation wasn't earned by some billion dollar PR effort with catchy phrases, it was earned because we've attracted great talent from all over the world and they are continuously examining our open source code, and testing our releases and developer builds, helping to find and fix software flaws before they become security exploits.
This is one of the areas that proprietary software has a difficult time competing with open source and the discovery and fixing of this GIF buffer overflow is a perfect example. Because security experts have direct access to the code as it's being developed, and have a direct line into our development and testing process, these kinds of issues usually get reported directly to us.
So grab the new Firefox 1.0.2 bits :-)