They focus a ton on the browser. I use chrome a lot less than Firefox and I still see chrome tab crashes more often. Spidermonkey performs amazingly today, and

They focus a ton on the browser. I use chrome a lot less than Firefox and I still see chrome tab crashes more often. Spidermonkey performs amazingly today, and even beats V8 on its own benchmarks. FF used to be resource hungry, but now is a lot lighter on memory usage than chrome. Beyond current tech, they're investing heavily into Rust and Servo for the next generation, and their ES6/7 support has been steadily growing. By all measures, it's clear that they have goals on the browser and they take those goals seriously. What else can they do? Third party desktop mail clients are just not a killer feature for the vast majority of users. IoT may not be a winner for various reasons, but I'm sure it can't be easy trying to figure out where to go from here. (let's face it, IoT is going to be the same locked-down, vendor-specific experience that Internet tv has become; and without manufacturing a must-have device or buying out a manufacturer of one, why would Mozilla win in that field?)