I've been on Firefox since they launched their quantum version a few years ago after a few years of using Chrome. I like Firefox but I notice a lot of people around me seem to default to Chrome. Things work well enough on Firefox that I don't consider compatibility a problem. But I do get a lot of raised eyebrows from people who consider this an extreme thing to do. Just like back in the day where I was doing most of my browsing with alpha builds of Mozilla Phoenix instead of just using IE like world + dog.
But what matters is that the market has changed. 15 years ago when MS made their anti competitive moves with IE and in the process helped Mozilla survive their Netscape implosion through reinventing themselves through their Phoenix -> Firebird -> Firefox reinvention (I used all of those). However since then, the market has consolidated around just 3 browser engines: Chromium, Webkit/Safari, and Firefox. Of those Chromium essentially powers all of the Chrome alternatives that aren't Firefox or Safari (Edge, Brave, Opera, etc.). Another change is that the web has imploded to just a handful of websites gobbling up most of the traffic. Yes there are a lot of websites but mostly the way to them leads via Google, Facebook, Apple, or MS owned properties.
Finally the ad market has changed. GDPR and related efforts in other markets (including the US) are pushing the market towards more responsible behavior with respect to getting users to opt in and to ad experiences that are increasing harder to block because they don't necessarily come via separate websites and domains.