It's depends.
Initially firefox, because of dev tools and available extra extensions (php, screenshot, ruler, interconnection, debug tools...) was a thing before chrome even exists.
Why I write, it is depends. Because there are many factor in this question:
Continent, region, country (same thing like Linux distro usage.... redhat and fedore rules in the US, but in EU nobody will touch them)
Project needs (for example a german bank uses only chrome for intranet, so everything should be optimal only for chrome)
Dev environment (there are places, where you only could have limited softwares like headless chromium (iot, arm, P.O.S. systems))
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It's depends.
Initially firefox, because of dev tools and available extra extensions (php, screenshot, ruler, interconnection, debug tools...) was a thing before chrome even exists.
Why I write, it is depends. Because there are many factor in this question: