Really? That seems hard to believe.
I stuck with FF until around 2016 or so before being compelled to switch. The performance was just very clearly worse than Chrome's at the time. Not sure what the state of things is now.
This is HN, so another huge reason to use Chrome is for the devtools, which I've always had a very good experience with and know pretty well. I've always found other browser devtools miserable to work with in the past, though I admit I haven't invested serious time into learning them.
All that said, the adblocking fiasco may well get me to try out FF again as my daily browser. But personally I had very clear reasons for abandoning it originally, it wasn't just cargo cutting