Recently facebook made its font smaller. It worried lots of people with weaker eye sight. The font looks ugly as well. They reduced it all the way to 11px from 13px. And changed its color to #000 from #333. I made a quick greasemonkey script as it works cross-browser to fix the issue until facebook does something about it.
You can install the script from the following link:
Google Chrome: Chrome doesn’t need any extension for this to work. It’ll install the script right away.
Firefox: You need to install greasemonkey extension from https://addons.mozilla.org/en-US/firefox/addon/748/
Opera: It has its own Userjs API. This script might work on Opera. However, it has not yet been tested.
I don’t recommend using any version of IE, hence no instructions for that.