It's too concerned about privacy. People want to give all their information to Google, so they all use Chrome.
I've found certain sites don't work very well on Firefox and after checking out other browsers, I now use Brave. Everything works well on it so far.
Google is a gigantic, profit-oriented, multi-national company with an array of services accessible under one account. Mozilla is just a little "non-gains" software outfit with barely over a thousand employees and limited means to advertise its browser. Go, go, Underdog. One thing Firefox could add is its own built-in, free pseudo-VPN like the even less popular Opera or Epic browsers. Doubtless expensive, though. (Which is to say, they'd probably have to pay for it by harvesting significantly more user data, like Google Chrome.)
I use a browser called Avant. It is essentially a shell built around IE11. It also has options to use Firefox or Chrome engines (user can switch at any time and designate which browser to use for specific websites). I used to use Firefox option, but recently I found it had too many glitches, so I switched to Chrome option. The thing I like most about Avant is the user interface, which is more cluttered than Chrome itself, so I can get view, bookmarks, etc. immediately, rather than opening a menu.
