One thing that we can talk about is that Mozilla is the single browser vendor working in the open. The source code, the development process, the roadmap and teams are all open. You can be a part of the development process and help make the Firefox you want.
The cool thing about the Web is that we can all be makers in this medium. Our collective strength and will can do amazing things when we work together. If you moved to a closed source browser or to some browser where the development is not that open, then, why not move back and help make it better?