At the end of the day, it's pointless to have a beautifully engineered browser if 50-60% of the websites don't work because they were designed for chrome. That's the future of the web unless someone stands up to them.
Unlike IE, a well engineered browser won't cut it anymore. I only see two paths going forward from here:
future 1. google goes full baddie and severely nerfs ad blockers to the point where over 50% of the time you get ads. This is a problem with technical solution thus easy win for firefox
future 2. google nerfs ad blockers but not hard enough to sway browser usage towards firefox. Bad scenario, Google remains dominant and free to nerf the competition by making chrome specific apis or other shenanigans that they know most websites will adopt