I did the ff-chrome-ff switcheroo a number of times. Now I generally use both: I find that chrome is a snappier startup and has a better flash runtime (since it does its own rather than relying on adobe). Firefox is more stable / uses less memory for a larger number of tabs.
I do believe in the mozilla mission for an open web, and it's got fairly comparable performance overall, so I use it for my main browsing / firebug. Chrome's for flash-heavy sites and playing with webrtc occasionally.
Inspector on chrome has certainly become quite good -- I've missed firebug less and less over time as I started using it. Though Firefox's new built-in developer tools are really sweet and might add enough functionality for me to miss in the near future. They're adding a command line thing that is super cool!!