I'll say it depend on what you do, because firefox devtool for ServiceWorker and PWA are really bad, and in my personnal opinion, JavaScript debugging is more intuitive on chrome than firefox.
On another hand, debugging on a vastly used browser let you catch more bug on it, and chart talk for themselves ( https://www.w3counter.com/globalstats.php?year=2020&month=6 ).
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I'll say it depend on what you do, because firefox devtool for ServiceWorker and PWA are really bad, and in my personnal opinion, JavaScript debugging is more intuitive on chrome than firefox.
On another hand, debugging on a vastly used browser let you catch more bug on it, and chart talk for themselves ( https://www.w3counter.com/globalstats.php?year=2020&month=6 ).