
Non-chat is darkened, and emotes are tinted and italicized.
For people who what to customize more, I have it mark the entire event, character's names, "quoted" parts of events, and *emoted* parts of events. On top of this, Cantr already marks types of events (you could detect if it was a character talking, or a radio for instance) so there's lots of possibilities.
To use this you'll need either TamperMonkey(Chrome), GreaseMonkey(FireFox), or the equivalent for your browser.
Now get one of the versions of CVEE (this extension/userscript):
Basic Edition - This should work right away, like shown in the image above.
Advanced Edition - There's some instructions on the page to get you started (and the CSS to make it work like the Basic version) so you can make your own styles.