Firefox - Need to auto-Cancel authentication pop-ups

[edro]

We have a corporate web filter that blocks 50% of the web.
It really sucks, because any time I do a Google Image Search, I have to hit Cancel like 20 times because of all of the images that are hosted on blocked sites. (Photobucket, imageshack, etc.)

Here are my pop-ups.

Untitled1.png
Untitled2.png

Does anyone know of a Firefox add-on or work around that will prevent these from popping up, or that will auto-Cancel them?

Thanks!

Oh, and when I enter in my Authentication info, it just pops up a page that says "This is blocked. Category: Web/Image hosting."

EDIT: I am not asking how to use a proxy! I am asking how to Auto-Cancel these pop-ups. I know the blocked content will stay blocked and I am fine with that.

 

[MrChad]

Try this

http://sivel.net/2007/05/firefox-ntlm-sso/

 

[Newbian]

Have you tried asking the tech people where you work?

Usually they do this for a reason and asking for a method around your companies filters does not go well here.

 

[edro]

Originally posted by: Newbian
Have you tried asking the tech people where you work?

Usually they do this for a reason and asking for a method around your companies filters does not go well here.

I am not asking for a method Around filters.
I am asking for a Firefox method to hit Cancel automatically.