On my last website, the text is perfect naturally on chrome and firefox without touching font-smoothing or anything else.
But on Mac / Safari 7 the text appears well the
Using -webkit-font-smoothing: subpixel-antialiased
worked a little bit, but there was still too much of a difference between Safari, Chrome, and Firefox. I realized trying to make the font thicker in Safari wasn't going to work, so instead I made the font lighter in other browsers and then used a slightly thicker font weight. What ended up normalizing the font weights across browsers for me is this:
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;