Firstly you need to be absolutely sure you want to remove that glow as it is an important usability feature. If you really want to do it then add this to your CSS:
The text feature on the MacHeist site is done using the CSS3 property text-shadow thus:
text-shadow:0 0 1px rgba(0, 0, 0, 0.01);
Unfortunately Safari is the only browser that supports it at the moment.