What I liked about Chrome: optimized usage of vertical space and speed. But what I really disliked about it -- Chrome add-ons are useless. Chrome would never allow something like Firebug without being built-in. And I couldn't find a plugin with proper Delicious integration either.
Also, searching the history in the address bar works a lot better in Firefox -- probably has something to do with the way Chrome encourages you to use Google. And speaking of History -- Chrome still doesn't let you search and delete items in the search results page. What's up with that?
Now Firefox 4 has it all -- the interface is still not as vertical-space efficient as in Chrome, but as I understand it on Windows tabs do move in the title bar, and that little change is coming for Linux too.
I love Firefox 4. They did an awesome job.