EDIT 2016-07-04(Since this question is getting popular): This is a bug in Chrome. Developers are actively working on a fix.
EDIT 2017-05-14<
I found out -webkit-filter: blur(0) could fix your blurry font in Chrome on Windows:
-webkit-filter: blur(0)
JSFiddle
#projectPopup { ... -webkit-filter: blur(0); -webkit-transform: translate(-50%, -50%); transform: translate(-50%, -50%); }