One day later, I will add that switching to Firefox has not been seamless. If it doesn't know a website, it will give you a pretty alarming notice to that effect. And I had to download a plug in for flash player that I thought didn't work until I shut Firefox completely down and restarted it. The little notices like "do you want to download this file" and such are not where I expect them to be after years of IE but I expect to adjust to that. One especially good thing is that hitting the back button on IE used to often take me to nowhere (if you look it said google leads or something like that most of the time or something that started with "ad" that couldn't be a good thing). I am not having that occur at all so far and that alone makes me very happy. I had resisted going to another browser simply because of my familiarity with IE but I have to say I am overall happy that I did this.
BTW, I have automatic updates OK'd for my windows PC (I want the security patches and such). It downloaded and installed the IE 10 which is where I thing my problems began. When I tried to download Firefox it also detected that as a virus and wouldn't download it. Fortunately I had an alternate browser available (Chrome) that let me get Firefox. The reason I went with Firefox is because that is what an IT guy from work recommended.
Anyway, do what you want but this has worked for me.