Download plugins first from http://www.sopcast.com/download/mozactivex-ff-15.xpi then save it and extract it, after you get 7 files, go to My Computer, look for Moizlla Firefox folder (most ppl have in local drive, program files) and then in Mozilla Firefox folder you will see plugins folder, open that and paste those 7 files which u got after extracting, and open yr Firefox, in address bar type about:config and press enter, then you will see filter box and paste this there security.classID.allowByDefault and you will see in list (not all see that but i did that way so thought to give you) if you see then double click on that and value will change to true and then restart yr firefox, and you have it!!
GOOD LUCK!!