I mostly wanted to indicate that it's a bit unreasonable to assume that because one person (grkvlt) does not install an adblocker - it's safe to assume almost no one does, as insinuated grkvlt's comment (at least by how I interpreted it).

That said, of course the usage numbers I quickly retrieved from Mozillas Add-ons for Firefox page - are not conclusive of total adblocker installment. I took two sample add-ons. There are at least a dozen add-ons just for Firefox. Even Firefox itself has adblocking capabilities by the way.