That is what is frustrating, indeed.
Firefox is not perfect. Nothing is perfect. There have been changes in Firefox over the years that I don't like. (I'm still hurting from it moving the tabs to the top, so annoying.)
In a scale of 1 (100% user-hostile) to 10 (absolutely perfect user-centered browser), Firefox only scores a, let's say, eight.
But chrome scores a solid 2, so obviously I'm not going to use it, ever, no matter if Firefox makes the occasional mis-step.