all i did to install the plug in was - click on the game manager (bottom left side) then it installs on its own. i am using chrome btw. there was some people having this issue ill read up on it and repost for u ZS.
i am having some problems of my own as well. BF3 stops working and i have to restart it.
I have been reading alot of the problems on their forums they better fix right away or they are going to loose lots of people. they are having lots of connection issues, sli issues, and crashing issues.
Also make sure to update your origin. when Origin is open and it says Origin Beta at the top then u need to update it. if it says origin prerelease then u are ok for now

. to update - click on costomize and control, settings, scroll down to prerelease participation and check the first box (update to prerelease version). hit apply, then shut down origin and restart it. upon restart it will auto update to the newer version. This fixes some issues with games (so they say anyway

z).
btw if u have a anti virus runing disable it, esp avast, they are having lost of issues with antivirus and the game.