Taking credit for inventing features that Opera have had for ages.
First of all, even if they were to do so, that is not FUD. The deal that Firefox has is it is up against Internet Explorer, not necessarily Opera. Why make this distinction? Because Firefox is free, as in Beer, Freedom and PunBB. They're marketing toward getting people who use IE exclusively to make the switch. Now, I don't claim that it is a perfect browser, but I do believe in my opinion that Firefox is generally superior. You have your opinion, I have mine. What I spread is not FUD. FUD = Fear, Uncertainty and Doubt. I'm advocating a product that has made my life better (hell, I'm a web developer) and I wish that upon everyone else.