[tambourine_man]

Firefox was a better product because it was faster, had tabs, etc and it generally rendered pages as expected.

That, in a large part, was on web developers, making sure the user who took the leap had a good time on arrival.

[zogrodea]

We can see a common sentiment by developers on this thread that they mostly test on Chrome, because that's where users are. I don't think it's likely many developers put in the effort for making the experience of using Firefox better when Firefox had such few users.