No, that shows javscript benchmarks, not the more ambiguous notion of "browser speed".
Anyway, Chrome and Firefox are tied in Kraken, which is the benchmark Mozilla created to simulate real world loads. (And thus, presumably, the benchmark they care most about when optimizing.)
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It's not a misconception. Here's a website owned by Mozilla, and even they admit it:
http://arewefastyet.com/
No, that shows javscript benchmarks, not the more ambiguous notion of "browser speed".
Anyway, Chrome and Firefox are tied in Kraken, which is the benchmark Mozilla created to simulate real world loads. (And thus, presumably, the benchmark they care most about when optimizing.)