Hi Polonus,
You are exactly right! Many don't know what a browser is. I ask them which browser are they using and they don't know what I mean. IE comes with Windows, they don't know there are better alternatives.
The same with Adobe Reader. I didn't know there were alternatives to Adobe Reader till last year when my copy of Adobe Reader became corrupt and couldn't open pdf files. That's when I learned of Foxit.
Since I've been with Foxit, I've never looked back.
My comments about users of IE & Adobe Reader were directed at those that should know better.
I can understand people using FF for the extentions. I'll open FF for something I can't do in Opera, when I'm finished that task I'm impatient to get back to Opera.
Fortunately I rarely need to open FF.