My firefox wont open when I've clicked the icon, though there is a little blue light underneath it. I've installed and re-installed it and still not working. When I do click the icon in the dock my entire macbook freezes and I have to manually restart it. I'm afraid my knowledge of stuff like this is exceedingly limited, I've read through numerous problem solving posts but I just don't understand the instructions others have given. This has previously happened to my firefox and i renamed the .exe(?) file and that made it work but I can't remember how I did it/can't find the post that helped me. I'm sorry to be so basic but I don't know anymore and want my browser working again!