Mozilla Front End Developer interview questions

Applied online, recruiter was nice. Was given a 40 min phone screening, during which I coded answers to questions via collabedit, which, of course is tormenting. Out of about 50 interviews I've been on, both over and well under my paygrade, this was by far the most negative experience. Interviewer acted very annoyed that he had to interview me. Would literally laugh AT me if I coded a syntax error due to trying to crank out an answer quickly. Questions asked were the typical complex JS questions, with me writing examples explaining each - scope, context (this, call, apply, bind), closures, prototypal inheritance. No questions concerning engineering mindset, experience or the like.