[vladvasiliu]

It's both, as in a vicious circle.

Sometimes "customers" don't really hold that much power. For example, I have to use my YubiKey with AzureAD at work. This is broken on Firefox on Linux, but works on Chrome. I can't just not log on to my work email and such. I would have chosen something else than AzureAD, but here we are.

I hate having to use multiple browsers, but I still want to support Firefox and only use chrome whenever I depend on AzureAD and make it a point to complain about it. What good did that do? MS sure doesn't care about it. "Just use windows". Right.

I'd argue many "customers" could possibly be convinced to drop Chrome in favor of Firefox, I don't think they care as much as HN posters do about this subject. They just want a thing that works. But if half the sites don't work, for whatever reason, they won't be wrangling two browsers like me. They'll just use Chrome and call it a day.

So whose fault is it that sites don't support Firefox? 90% of my colleagues couldn't code to save their lives (it's not their job, granted). And the other 10% will just go for what's quicker / easiest to implement. "Everyone uses chrome? Testing on chrome, it is.".