504544 - Bypass the 'Authentication Required' dialog box for locations to which I've already saved the password

Status: RESOLVED DUPLICATE of bug 223636

(Toolkit :: Password Manager, enhancement)

Description

[Cristiano]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5 (.NET CLR 3.5.30729)

I'm working at a customer site where I need to use a proxy server, in which I have to use a login and password. As I'm often working there, I've saved the login information (login and password) in order to start using the internet as soon as I launch Firefox.
But every time I launch Firefox, I have to click OK in the 'Authentication Required' dialog box (that shows up with the fields already filled - see a screenshot at http://files.getdropbox.com/u/1343125/Firefox3.5_ProxyPassword.png).
The point is: if I've already saved the login and password, why does Firefox need my confirmation to use this information? I've tested Safari web browser and it has a different approach to that: I've saved the SAME login info and when I launch Safari, it simply loads my home page without prompting for a click in OK button.
It's a little detail, but I think that getting rid of this annoying (unnecessary) dialog box would improve usability.
Rgd,
Cristiano

PS. Sorry if I was not clear or kind enough; English is not my first language...

Reproducible: Always

Steps to Reproduce:
1. Launch Firefox at a location in which I need to login in a proxy server.
2. 
3.