At the 2010 Mozilla Summit, I talked about my JavaScript engine and DOM fuzzers, which have each found many hundreds of bugs. I also talked about the automations that keep me sane when I fuzz these complex components.
My slides are in the S5 web-based presentation format. You can click the Ø button to view the presentation in "handout mode" and see what I planned to say while each slide was up.
I shared a presentation slot with Mozilla contractor Paul Nickerson, who has a separate slide deck. He wisely saved the best part of his talk for the end: a demo of his font fuzzer causing Windows 7 to blue-screen.