I'm currently using Ubuntu 15.10, but I had the same exact problem with 15.04. I experience a tearing while doing pretty much anything: it ranges from barely noticeable when watching a film with VLC to annoying when browsing or watching a video with Firefox, and it's god awful when using Chrome (which is currently the only way I have of using Netflix). Oddly enough, when I play this game it suffers from little tearing. Thanks in advance for your help. I tried fixing this issue once and I only managed to mess up my former installation of Ubuntu.
EDIT: I forgot to mention that this happens both with with the recommended nVidia driver and with the default open-source one; the latter seem to do a teeny tiny bit better, but I might be mistaken.