I currently have Firefox configured to associate the "playonlinux://" protocal with POL, however when I click the list nothing happens. Additionally, Origin isn't listed in the insallation list within the program itself.
Origin install script was not satisfactory want was dropped (details in french in http://www.playonlinux.com/en/topic-10512-Origin.html but that's basically it).
Origin does work if you do a manual installation, but its buggy at best. I was able to install it, but unable to install a game and launch it. Origin on WineHQ