I think the comment above regarding Firefox not being 'competitive' in today's world is spot on. With smartphones and tablets (that have certain other browsers 'baked-in' offering better performance etc.) becoming (if not already there) the media-consumption device more and more people reach for when wanting to 'quickly look up that thing' or to 'show that friend that cool video' etc. etc. statements such as that made by Leo the Lion should not come as a surprise.
Are we talking apples and oranges here? True, there are numerous mobile devices with in-built browsers, but I do believe we were talking Chrome on the desktop here. I may be mistaken but it did appear that way... and Firefox is far from being a spent force on desktop/notebook PCs.
As for quickly looking up that thing or two - on those piddly little screens - when my niece, nephews, sister and others want to show me something they have on their phones [sometimes tablets], they plug them into my PC to watch/look at them on the bigger screen. Granted, it might be convenient while out and about, but showing video on a 4 - 5 inch screen loses something in the presentation as well as the detail. Yes, many phones/tablets have high resolution screens, but they pale in significance when showing the same content on a bigger hi-res screen.
Don't get me wrong, I have a mobile phone and a tablet for when I'm out, and I like them for the purpose intended, but I much prefer a desktop PC for the greater power, added peripherals and obviously, the bigger screen when at home. True, that is my preference, but I am not alone. Even the younger members of my extended family, many of whom live on their mobile phones while out, prefer to sit at a desktop PC when at home... and I'll bet it's a scene that's repeated throughout many households around the world.
So when you speak of your circles, is that while you're out and about... or while you're in their homes? The reason I ask.... apple and oranges... like what people do behind closed doors may be entirely different to what you see otherwise.