Firefox automatically checks for updated version of installed Search plugins.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-19744	DTBF085	SV-21890r1_rule	ECSC-1	Medium

Description
Updates need to be controlled and installed from authorized and trusted servers. This setting overrides a number of other settings which may direct the application to access external URLs.

STIG	Date
Mozilla FireFox Security Technical Implementation Guide	2020-06-19

Details

Check Text ( C-24190r1_chk )
Type "about:config" in the browser window. Verify the preference "browser.search.update” is set to "false" and locked. Criteria: If the parameter is set incorrectly, then this is a finding. If the setting is not locked, then this is a finding.

Fix Text (F-20416r2_fix)
Ensure the preference "browser.search.update" is set and locked to the value of “False”.