I haven't had any of the problems you mentioned.
Maybe it was a faulty install or the problem lies elsewhere in your specific case. I have been able to do everything you say your installation won't do, and I do it on a regular basis. So far, zero problems.
As to reverting back to older versions, they are still available....I'm not sure how you could miss that if you ever visit their home page.
I have visited their homepage and all the links point to 2.0. Don;t get me wrong, i love firefox and have used it for around 2 years. But 2.0 is not working on my machine. i removed it and re-installed and had the same issues.