The only thing I like about Firefox nowadays is that they now own Pocket, my favorite read-it-later service. Haven't touched the browser in half a decade, and haven't missed it.
Actually yes. I've seen it in real-life desktop business environments just weeks ago. And here at my place it keeps some old hardware still viable and usable on the web of 2017. If albeit a tad slow.
Now Firefox Mobile? I doubt it. Not much anyways..