why Firefox 18 behind proxy server is refusing all https connections?

I used to have Firefox 17 and everything worked ok but I just installed Firefox 18 in my Windows XP sp3 environment and I cannot connect to https sites through company proxy. Company proxy requires LM/NTLM authentication, proxy server is an IPCOP machine (squid proxy.) After updating to Firefox 18 for every site that uses an https connection the response is: The proxy server is refusing connections

              Firefox is configured to use a proxy server that is refusing connections.
 Check the proxy settings to make sure that they are correct.
 Contact your network administrator to make sure the proxy server is

The log of squid shows lines with denied connection because of required authentication parameters (domain/username and password) 1357912572.640 1 (my ip address) TCP_DENIED/407 1586 CONNECT - NONE/- text/html As you can see no domain/username were filled in log. here is a line with permission granted from another browser 1357920874.657 1348 (my ip address) TCP_MISS/200 2549 CONNECT (mydomain\myusername) DIRECT/ - I modified sensitive data

Thank you

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