In an interview with OnSoftware, Jay Sullivan, VP of Products at Mozilla, insisted that Mozilla is not planning a version of Firefox for Windows Phone 7



From WP Central:

At the moment we are focusing on Android in terms of the browser. For those other platforms we may do things like Firefox Home, so you can fire up any browser and get to your Firefox data. We?re not looking to bringing Firefox itself to Windows Phone 7 at this point.

  Jay Sullivan says Firefox is not coming to WP7