about my genius keyboard kb12e

So I have this keyboard and I have no idea why the back and forward keys with Firefox doesn't work these are the driver photos version 7k 2.0
http://postimg.org/image/zeeid2ult/ http://postimg.org/image/cdqzkxefx/ http://postimg.org/image/40lg0uhhb/ but I can't configure the back and forward button, although they work on the windows folders but not in the browser these are the keys i want to get them to work http://postimg.org/image/48g7fa4ql/ so any ideas? any add on that could work?