0.01rem Letterspacing

You're totally right, Stephen. Not that I doubted your advice. I tried applying a letter-spacing of 0.01rem, and there's a noticeable improvement in Firefox. See the full shot (attached) or use Firefox to flip between the unspaced and letterspaced texts.

Safari does not seem to respond to this letter-spacing value. It only reacts to values equal to or greater than 0.062rem, at which point it appears to round up to 0.1rem (much too loose).