How to get rid of authentication popup?

[Luthier]

Hi,

How can I deactivate the automatic opening of the authentication popup for a particular site?

At work I'm behind a firewall and for many sites, when we try to connect, it asks for login/pass to get the right to go there. But I dont have such login/pass, so all I can do is "cancel". For some portal webpages with multiples portlet linking to multiples sites (images, medias, etc...) this leads to that popup opening several times on my firefox when loading the page, one time per filtered link. It iss very disturbing...

What I want to do is deactivate the popup opening when it comes from the firewall's IP. In that way I will be able to load at least all allowed parts of these portals without having to click on "Cancel" 20 times a load!!

Is it possible?

Thanks in advance!