Looking at those browser stats, you might find Firefox, hovering at around 9% and think, that's terrible! The other browsers must have 90%! But that's not how it works. Chrome has around 14%. Safari has around 3%. Opera has around 2%. Together, these browsers are responsible for 28% of the traffic and Chrome simply has half of that. But really, it's a question of 14% vs. 9%, as far as I can see.
I wonder why Chrome is downloading bigger volumes, though. 🤔❓