Look at this thread. If you were to believe every comment about what "the users want", then they want deeply contradictory things.
What you mean is "why doesn't Mozilla listen to me?" "Why aren't they tailoring their browser to meet my specific needs?"
We've got people here claiming that all Mozilla does is remove features. We've another camp complaining that all Mozilla does is add needless features. Then you have the camp that isn't happy even when they get what they want. They complain about the plugin system, then complain when they get exactly what they wanted. They complain about imaginary problems. They complain about things that were fixed years ago. I wouldn't listen to this group of users either.