You'd be surprised. I know quite a few people still using 2.x They (we?) come from an era where you don't upgrade just because there's an upgrade available - you make changes when you're affected by a bug, or something important to you quits working.
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Don't know how unique I am, but clicking the test button there causes (old, 3.x) Firefox to crash.
>(old, 3.x) Firefox
That should be unique enough... :)
You'd be surprised. I know quite a few people still using 2.x They (we?) come from an era where you don't upgrade just because there's an upgrade available - you make changes when you're affected by a bug, or something important to you quits working.