I am behind a corporate proxy that does not require authentication for normal web browsing. However many sites are blocked and I presume they could be accessed with the appropriate credentials. However we do not have access to such credentials. There is a proxy authentication dialog box that keeps popping up (sometimes mozproxy, sometimes ntlm) and I keep having to click 'Cancel' or 'OK' - they do the same thing. I am looking for a way to disable ALL proxy related authentication popup boxes. I have no credentials to provide and will never to able to load certain sites.