Mozilla is the only browser that matches IE in features, and that I adopted as a work tool since version 1.1, for two very simple reasons:
- Tabbed Browsing - the quintessential way to do real web surfing and the only practical way to do web development
- It works on all the platforms I work in (Windows, Mac, Linux) in absolutely the same way.
I have since moved on to Firefox and Thunderbird as my standard non-Mac browser and mailer, but Mozilla still comes in handy sometimes due to its News and IRC clients.