Lots of good reasons already mentioned, but there were 2 killer reasons for me: developer tools and extensions. I really wanted to stick with Firefox, but as someone working on the web, it was an appalling experience. And then Chrome just kept getting better and better extensions that I couldn’t find elsewhere.

Obviously Firefox becoming much slower and heavier over time, whilst introducing anti-features didn’t help either.

I despise Google now, so I don’t use Chrome anymore. But I’m not going back to Firefox either. The trust battery towards Mozilla never got back from zero.