I recommend the privacy.resistFingerpriting about:config mentioned. It's been available for a while and does other things too, like changing your user agent.
I've been using privacy.resistFingerprinting for a while and also recommend it, but there is one major "side effect": your reCAPTCHA score will drop to 0.1 making many websites really tedious to use. It's a price I'm willing to pay though...
reCAPTCHA is a Google thing so it gets blocked in my browser already anyway (by uMatrix). If I need to load it to see a website, I close the tab immediately and go somewhere else.
You need reCAPTCHA to log into HN (or at least I do when I'm working from some parts of the middle east)
I use a mobile app and have gotten errors saying I need to solve a captcha. Since I can't do that on this app, it just means I'll stop commenting for a couple days until HN decides to stop bothering me.
That's happened twice, and it really hasn't been a big deal. I've never actually done a captcha for HN, it's just not worth it to me.