I think the numbers in themselves don't say that much.
I just checked and 9.7% of the surfers on Booballistics use Firefox. But I would like to know how many of those 9.7% are actually in the group of potential buyers?
The way I see it from speaking to friends (and I could be mistaken) - Firefox is for those people who:
1. Just plain hate Microsoft because they have the "nerve" to make money on computers.
2. Want free stuff - Basically not so different from groups 1.
3. Mac people and other computer minorities.
People from groups 1 and 2 are highly unlikely to buy anything and therefor I really don't care if they can see my sites.
People from group 3 obviously have too much money (or else they would have bought a REAL computer for less money
) and I like those to see my sites.
But consulting my serverstats once again I see that only 2.4% of my surfers are on Macs. And I think it is reasonable to assume that not ALL Mac people use Firefox. So I am now down to less than 2% of my surfers that might or might not have a problem.
I can live with that!