I use both Chrome (for work) and Firefox (personal) on Windows. Beyond a few specifics, I often can't remember which I am using. There might be many differences under the hood, but in a regular usage Firefox is really damn good. Even on Google's properties. I also use Firefox exclusively on mobile, and same. At the end of the day, they are two very mature, slightly different executions of the same concept. I get the frustrations that may exist on the power user / dev side, but I think our crowd is generally not fair enough in recognizing the tremendous efforts it take to compete with Google with a fraction of its resources.

Note: I use Chrome for work to 1/ isolate my work from personal sessions without the hassle of containers or profiles, and 2/ because I work for a web app targeting Chrome (per the market share).