Firefox automatically updates installed add-ons and plugins.

From Mozilla Firefox Security Technical Implementation Guide

Part of DTBF090-Firefox Preferences-Addons\ plugin updates

SV-59603r1_rule Firefox automatically updates installed add-ons and plugins.

Vulnerability discussion

Set this to false to disable checking for updated versions of the Extensions/Themes. Automatic updates from untrusted sites puts the enclave at risk of attack and may override security settings.

Check content

Type "about:config" in the browser window. Verify the preference “extensions.update.enabled” is set to "false" and locked. Criteria: If the parameter is set incorrectly, then this is a finding. If this setting is not locked, then this is a finding.

Fix text

Set the preference “extensions.update.enabled” value to "false" and lock using the Mozilla.cfg file.

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.