Comment 10 for bug 86689

Yes, the same problem is still in effect as of Firefox 20.0 on all of my Ubuntu 12.04 LTS systems including a clean install.

The problem and a successful workaround are described well here:
http://keramida.wordpress.com/2009/11/07/dejavu-condensed-as-default/

From reading other bug reports and issue trackers, it appears that application teams (Mozilla and others) and GTK+ developers have pointed at each other, so the problem is stuck in the "probably won't fix" zone and has been for several years now. This is bad for a lot of users who find DejaVu Sans Condensed to be by far the clearest, most readable and comfortable font on their machine, especially for web browsing.

I am sorry that I currently have to trick Firefox into recognizing this font by forcing a font substitution. At least it works, which is more than I can say for Chrome... thus far I have not discovered any way to make DejaVu Sans Condensed available in Chrome's font picker. That issue alone is completely constraining my choice of browsers.