Even if you assume that 50% of Firefox users are falling into "they wouldn't visit those sites to begin with" or "they run a user-agent spoofer" you're basicall

Even if you assume that 50% of Firefox users are falling into "they wouldn't visit those sites to begin with" or "they run a user-agent spoofer" you're basically going from 2-4% to 4-8%, and the trend is clearly negative.