Firefox v30 for Macintosh has disabled support for NT LAN Manager v1 Network Authentication (a.k.a. NTLMv1) for security reasons.  The impact of this change is authentication to SharePoint sites such as Groupshare ( is blocked for Macintosh users with Firefox v.30 and later installed.

Information about how to re-enable NTMLv1 authentication and other notes about this change is at:

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Last updated: 
April 25, 2017