TIL that the following CSS font smoothing rules, really make a difference on Apple OSs (Firefox and WebKit-based browsers):
body {
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
Take a look at the difference with and without here and here.
Even though there are some arguments against it I still think the pros outweigh the cons, so better to set these rules.