Firefox is not configured to block pop-up windows.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-57601	DTBF-0014	SV-72011r1_rule		Medium

Description
Popup windows may be used to launch an attack within a new browser window with altered settings. This setting blocks popup windows created while the page is loading.

STIG	Date
Mozilla Firefox	2017-03-22

Details

Check Text ( C-58433r3_chk )
Procedure: In about:config, verify that the setting for the following Preference Name’s are set and locked. “dom.disable_window_open_feature.status”, set to “true”. Criteria: If the values of the listed Preferences are not set and locked to these settings, then this is a finding.

Fix Text (F-62801r2_fix)
Set and lock the following preferences using the “Mozilla.cfg” file: “dom.disable_window_open_feature.status”, set to “true”.