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I honestly wonder if this is real, or the whole story.

How many websites are actually doing things that require a meaningful amount of extra effort to support Firefox if it already works in Chrome/Safari?

For most websites, cross-browser testing is almost an afterthought these days.

> For most websites, cross-browser testing is almost an afterthought these days.

Most of my time involves fixing things for IE11 or mobile Safari, Firefox-only or Chrome-only issues are extremely rare.

Yeah, agreed. I think I run into more issues in Safari than anywhere else these days.

It's always some weird rendering bug that mysteriously vanishes with the old null transform trick.

Yes exactly, it's either that, or some random JS feature which is unsupported or does not work as expected.