Then I realized the (not so) sad fact that this does not apply to me anymore at all. I have completely switched from Windows to a combination of Mac and Linux. This was really an organic process where I realized one day that I don't use Windows anymore. I may still use a Windows VM or two when doing development work for some clients, but web browsing is done on the host (Linux) not on the VM.

And I am genuinely curious... What sites have you experienced that don't work in Firefox. Seriously, in the several months since my transition, I cannot recall a single one. I have run into numerous sites that don't work quite right in Safari but they all seem to do fine on Firefox... which has led me to stop using Safari on my Mac.

Now, I know that drawing conclusions from my personal experience like this is tantamount to saying that there is no such thing as global warming because it is cold at my house. Still, I can't help but wonder... how big of a problem is the IE-only site these days?