It is ver 2.0.0.1 sorry I was a little rushed when I wrote the post.

I have checked my about:config and all looks ok. I have started my FF with no add-ons loaded so I know it is not any of those but still the problem persists. All my useragent settings in FF itself are set to default and I dont use a user agent switcher. And finally I know it isnt the websites because they are sites like eBay and my friends with FF ver 2 have no problems and this problem for me is very recent (since my son have started playing with my keyboard)

[EDIT:] OK I got it sorted, wasn't anything to do with my browser. He had somehow turned my firewall to Stealth browsing mode. Well at least I know for next time.