Here are some cases where Firefox really sucks: some of them are specific CSS styles, some are downgraded features, and some of them I just don't know why. As I mentioned here, the ChatGPT web and Gemini web used to be very laggy for no reason—or maybe it was just a bug for me?

I don't think any of this is caused by add-ons, though.

But it's getting better, and most of those problems are just gone;

Still, I keep Chrome around just in case.