To be clear, Firefox doesn't care about this benchmark either. It just so happens that changes we made for Speedometer also improved our performance here, which

To be clear, Firefox doesn't care about this benchmark either. It just so happens that changes we made for Speedometer also improved our performance here, which is a fun coincidence but not important in the grand scheme of things. (Speedometer is the benchmark that most closely approximates messy real-world code.)