Mozilla Senior Frontend Developer interview questions

Long, disappointing process: 6 rounds over 6 weeks, including HR screen, hiring manager, take-home challenge, two technical interviews, and a final manager interview. The technical interviews felt cold and transactional, with little rapport or conversation. After investing significant time and feeling I performed well, I received no update for over 4 weeks, then only a generic rejection email with no feedback. I expected better candidate communication from Mozilla.