Cross-browser kerning-pairs & ligatures
http://www.aestheticallyloyal.com/public/optimize-legibility/

Improved handling of kerning pairs and ligatures in modern browsers using the text-rendering: optimizeLegibility; declaration.

Improved handling of kerning pairs and ligatures in modern browsers using the text-rendering: optimizeLegibility

It's all about a declaration. Try: text-rendering: optimizeLegibility; and you're done.

CSS statement supported by Webkit and Firefox.