ZDNet reported a couple of days ago that Firefox's market share figures are inflated, according to Jon S. von Tetzchner.
Jon actually had a long talk with the journalist, but it seems that they decided to go with this particular story, which made it sound like he was attacking Firefox.
I personally don't think it was meant that way at all, but the browser wars are probably something a lot of people are interested in reading about, so that's what journalists often write about…
Update: I have to mention this one. The Register has its own take on the whole thing. It's an amusing and informative read from a publication which "ignites the flames" by being a bit different (in a good way, from my point of view) 😉