Firefox doesn't show popup for authentication

I use firefox for internet access through my University proxy. I type my password and my user account.
Recently, firefox does not show the popup for authentication, where I type my user account and my password, so I can't access my network of the University. I have not changed the proxy configuration (I checked it, it's as it should be).
When I try to access any Web site, I get the message "access to the cache of refused" and it says that I have to authenticate to access. However, there is no authentication window to enter my user account and password.
I tried to configure Chrome and Safari, and they worked perfectly.
My computer is a mac running the mavericks.

See:

In Firefox 30 and later NTLMv1 auth has been disabled, NTLM supported on platforms other than Windows is now obsolete

In Firefox 31 for NTLMv1 auth has been restored to only secure connections (Bug 1023748).

  • Network.Negotiate - auth.allow - insecurity-ntlm-v1 = false
  • Network.Negotiate-auth.allow-insecure-NTLM-v1-https = true
  • bug 1023748 - Allow NTLMv1 via SSL/TLS or intranet access is broken on Firefox 30 for platforms other than Windows

Tags: Firefox

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