Don't you often feel a lack of self-worth when your HTML/CSS renders well in Internet Explorer, but not in Firefox?

Not at all, because I do NOT design for IE from the start. I always design for FF (and other more standards-compliant browsers) FIRST, then, when it's great in FF, I go back and beat IE into submission

Save yourself the headaches, work in FF or Opera to start with, then go back and deal with IE's bad behavior.

I do, yes - but I always check IE as I dev, and sometimes find that something works when it doesn't in FF :P

Ok.. but the point is to NOT compare what works in IE with what works in FF because most of the time IE is doing it WRONG. FF has few bugs, IE is loaded with them.