spreadfirefox.com is organizing what could be the biggest promotion created and paid for by opensource community!
Make sure you join! (I already did 
“Let’s mark the launch of Firefox 1.0 with a community marketing campaign that will take the buzz around Firefox to the next level: the first-ever, full-page advertisement in a major daily newspaper created and paid for by the open source community.”
Opera is way better than Firefox. The most significant proof of that is the fact, that people install plugins to firefox for it to become Opera-like and Opera is Opera-like from the beginning.
It’s not just about tech specs. Being better is more than that. I do not know if Opera is better or worse. I know that firefox is great AND open source which means freedom for users and developers.