Comment by janalsncm

It might be helpful to ask the question in reverse: why was Firefox ever popular?

I would submit that the answer is that FF was an alternative to IE. And IE was trash. It was so bad that people would go out of their way to download FF.

Now, even if FF is marginally better, iOS Safari and Chrome (and I assume Edge although I haven’t tried it) aren’t that bad. So people don’t go out of their way to find another browser.