It's funny how the author is acting like Firefox isn't going to be enhanced anymore. By the time IE7 comes out, it will be even better. And I open PDFs quite a lot on Firefox and it's just fine for me. Most of my school notes are downloadable through the school website and in PDF format and most scientific papers are now in PDF. That's a pretty unbalanced article. As long as IE is integrated into Windows, it will be the most unsafe.