Replace? Probably not.
Challenge? 100%.
The variance in therapist quality is egregious, and should be discussed more, especially in this current age of "MEN SHOULD JUST GO TO THERAPY."
Or buy an iPhone or a Pixel.
Is having insurance not legally required? Do they just pay out when there's an accident where they injure someone?
However... a person who uses Firefox as their primary browser must generally still keep Chrome installed. A person who uses Chrome as their primary browser has no need to keep Firefox installed.
Firefox should endeavor to fix that.
First, Firefox should honor age-old tradition, swallow its pride, and spoof 99% of the Chrome user agent string. That's how upstart web browsers have fought against sites breaking things for them for decades.
Second, Firefox should endeavor to be as compatible as possible with Chrome with regard to the DOM and JS, being sneaky if it has to. I think O365 webmail is the first good place to start, since it's widely deployed. USG websites as well, like DFAS MyPay or Marine A-PES do not work well on it. Obviously, it's difficult for Firefox devs to test on these sites, but that's all the more reason to take bug reports seriously.