Some help please

[bmagni]

So, I installed the new version of Firefox like a week ago or so, after that it all has been trouble with some sites (ebay, amazon and live hotmail). I don't know why but sometimes they don't load and sometimes they do, I thought it was related to the java problem FF had, but I updated it and nothing has changed. All the other sites load perfectly.

Any idea whats happening and how can I solve this?

Thanks in advance