FF no longer displays many web sites, properly. at work, it's causing me great difficulty with the web sites I use for work. & it crashes. it has stop script errors. & many other problems. I need to get rid of it at work. How do I go back to a previous version? I really need to fix this a.s.a.p. in order to finish my work. This ver. of FF is horrible. It's worse than IE ever was. I was originally very happy when I switched from mozillas other browser to FF but now I seriously regret it & will be searching for an alternative.