Check the network panel. See the Megabytes of html and js a browser needs to work with.
It’s a miracle that browsers can render all that in the seconds it usually takes them, and if Chrome is a second faster, it’s due to the billion $ company behind investing the GPD of a medium-sized country into optimizing it.
As a FF linux user both at home and at work I can't say I've ever noticed FF being consistently slower. Having said that I have used nothing but FF for the last 20odd years so maybe I'm just used to it...
We already have uorgin block and https everywhere and privacy beaver.
They just want to make their browser even more bloated.
And lets not even talk about linux distro. On my xubuntu its even slower than chromium or chrome.
Here is my advice: Invest everything on speed. Your user already know about privacy and stuff. That why less than 9% of us are left.