minor issue at testcenter.duolingo.com
I am using firefox 32.0.3
If I click on "Read the validity study" at https://testcenter.duolingo.com/ nothing happens, I stay on the same page.
Only if I open the link in the new tab I can read the study.
In chrome it works fine.
Err, you do realize that link is simply a pdf file?
I think it is likely some problem on your end, because it works perfectly fine in firefox 29, and chrome. A simple link shouldn't cause any problem in even the most basic of browsers.
P.S. As far as I know, it is supposed to open the link in a new window.