I agree, that's a decent point, but I have a counterpoint. I think with sheer numbers alone, especially when it comes to the context of computers would give more accurate results even if they could be somewhat biased. A larger sample size is more likely to give a more accurate idea of a picture of what's going on. I also think if you compare an IT person, versus a non-IT person, the IT person is going to be able to identify Firefox being a search engine or a browser 10 times out of 10 lol, whereas with a non-IT person, those numbers could be anywhere except for 10/10, most likely anyway. lol