It's not in the official F-droid repository, which runs thorough code review and I quite trust, and I also do not know who the developers are. I'm sure it's a fine project, but my main concern personally was to move away from Aurora towards F-droid as much as possible. I have given up on getting away from Mozilla before Servo is ready, and until then I'm much happier to use something packaged by the Foundation than the Corporation.