Well that was fun. NOT! After about a hour of trying to get this and any extension to install. I thought I was going out of my head. Just click on the link, thats what they say! I finally found the answer!
BTW, there is a new minor version of Firefox out 0.9.3! I thought that was the problem so I installed it! NOT!
OK here is the answer, In Firefox, click on tools then options, then click on the advance tab. Go down to Software update, you need to put a check mark in (Allow web sites to install software). That did it I got that extension to install. Note you have to restart firefox to use it.
PS: After you have installed all you extensions it would be a good idea to uncheck that box.
Come see me at Systematic Investing group #board-966 lets talk formula plans.