Sites would not mark my session as suspicious so much which causes me so many evil captchas

More developers would test for Firefox again.

I do all my dev in Firefox and rarely test in Chrome. I've been made aware of maybe a handful of issues over many many years doing it this way. If it works in Firefox, 99.9% of the time, it's also working in Chrome.

That's because, with a few exceptions, everything Firefox implements is a subset of what Chrome, and increasingly Safari support