Firefox has issues once you step past the consumer ranks and it will continue to have issues as HTML and Javascript, the basis for a lot of the web, give way to newer markup languages. I think they will adapt and that is a good thing but Microsoft and Macromedia are leading the way.
The W3C is a joke and should go away.
I suspect 'power users', so to speak, will find IE or others a better bet. I just use it for reading FR, buying books from Amazon and listening to Limbaugh on the internet. For my uses, it works great.
I'm convinced a lot of folks are paying money to MS for bells and whistles they never use. I use MS Office all the time because that's what the military provides - but 95% of my work can be done in OpenOffice just as easily.
I also figure some competition for MS would be a good thing for all concerned.