Firefox – ajax.googleapis.com stopping the Firefox

Today for some strange reason, Firefox stops working properly because it is trying to fetch something from ajax.googleapis.com.

Is there something I can do to avoid this? Safari and Chrome work just fine.

I tried uninstalling Firebug and clearing the cache.

The only thing that worked was disabling the JavaScript altogether.

This seems to be the culprit link:

http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js

What can I do?

EDIT

I think I have found where the problem is. My proxy is serving one byte at a time the file, so firefox consume it at that peace.

What I don't understand is why Safari and Chrome takes it right away.

What I did last night was, leave the FF open all the night to give him change to load the file, my hope was that I got cached and the next time there was no need to go for it.

Today in the morning, the page load successfully but the page was not cached, because the next request failed the same.

Here's a video showing the problem: