Although then the "Wild isn't it" statement really isn't wild at all - Android is by far and away the most popular OS, not far off double Windows. Of course if you lump that in with Linux, Linux would be more popular than Firefox.
You've chosen to compare Firefox's share from all platforms to Linux's share only on desktop. I don't know whether this was deliberate misinformation-pushing, or an innocent brainfart/inability to parse data, but that's not how data is compared.
Firefox has 50-70% more users than Linux, depending on the platform you use for comparison.
No matter how you cut it, Firefox is more popular. It's more popular across all platforms as a whole, and it's also more popular on desktop.
And 4.45% of a far smaller number is not greater than 2.74% of a much much larger number.