Firefox 3.6 in Ubuntu 9.04 doesn’t work without proxy

I'm on Ubuntu 9.04. I've updated Firefox with ubuntuzilla. Now Firefox works only via proxy. How can I fix this?

Thank in advanced

hrm, that's a new one...

can you access the net without a proxy using other browsers? do you have any proxy set in the gnome 'network proxy' control panel? what precise settings are you trying to use when you try to access 'without proxy' ?