Firefox is configured to allow use of SSL 3.0.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-57581	DTBF-0002	SV-71991r1_rule		Medium

Description
DoD implementations of SSL must use TLS 1.0 in accordance with the Network Infrastructure STIG. Earlier versions of SSL have known security vulnerabilities and are not authorized for use in DOD. Firefox has this set to on by default but this is not apparent in the GUI options screen.

STIG	Date
Mozilla Firefox	2017-03-22

Details

Check Text ( C-58413r3_chk )
Procedure: In about:config, verify that the setting for the following Preference names are set and locked. “security.enable_ssl3”, set to “false”. Criteria: If the values of the listed Preferences are not set and locked to these settings, then this is a finding.

Fix Text (F-62781r3_fix)
Set and lock the following preferences using the “Mozilla.cfg” file: “security.enable_ssl3”, set to “false”.