I'm tired of all the (mostly technical) people whining that they need Chrome, and only Chrome can browse the internet. Then you ask them for a site that doesn't work and conveniently "it was some time back and I don't remember the details".
I've been using FF since before it was called Firefox. In the last 10 years I've not come across any site that doesn't work with Firefox - online shopping, social media, banking, custom line-of-business internal apps, ERP apps... you name it.
And, TBH, if I did, I'd just visit that one site with Chrome, and still use FF daily.