3-4 years back I have a strong feeling that FireFox is unmatchable and unbeatable but with the passage of time Chrome really established itself a lot and FF started loosing, different issues as Matt mentioned in last post.
Now after 4 years I have the same feeling for Chrome 
- let’s see who will beat them, might be FF will reign again and win the hearts of developers and users again who stopped using it or using as a second option.
Best of luck FF