diff --git a/conf/firefox-forbidden-policies.js b/conf/firefox-forbidden-policies.js
index ddba1f9d..bf84c3ac 100644
--- a/conf/firefox-forbidden-policies.js
+++ b/conf/firefox-forbidden-policies.js
@@ -69,7 +69,7 @@ lockPref("privacy.fingerprintingProtection.pbmode", true);
 // -FontVisibilityRestrictGenerics should allow fonts set in preferences to appear
 lockPref(
 	"privacy.fingerprintingProtection.overrides",
-	"+AllTargets,-KeyboardEvents,-CSSPrefersColorScheme,-CSSPrefersReducedMotion,-JSDateTimeUTC,-FontVisibilityRestrictGenerics",
+	"+AllTargets,-KeyboardEvents,-CSSPrefersColorScheme,-CSSPrefersReducedMotion,-JSDateTimeUTC,-FontVisibilityRestrictGenerics,-FontVisibilityBaseSystem,-FontVisibilityLangPack",
 );
 pref("browser.display.use_document_fonts", 0);
 
diff --git a/etc/firefox/policies/policies.json b/etc/firefox/policies/policies.json
index 739dd133..9a027c6c 100644
--- a/etc/firefox/policies/policies.json
+++ b/etc/firefox/policies/policies.json
@@ -1143,7 +1143,7 @@
 				"Comment": "Preference not allowed for stability reasons. :( https://searchfox.org/mozilla-central/source/toolkit/components/resistfingerprinting/RFPTargets.inc - If you adjust this, see also use_document_fonts to not increase fingerprinting surface excessively",
 				"Status": "locked",
 				"Type": "string",
-				"Value": "+AllTargets,-KeyboardEvents,-CSSPrefersColorScheme,-CSSPrefersReducedMotion,-JSDateTimeUTC,-FontVisibilityRestrictGenerics"
+				"Value": "+AllTargets,-KeyboardEvents,-CSSPrefersColorScheme,-CSSPrefersReducedMotion,-JSDateTimeUTC,-FontVisibilityRestrictGenerics,-FontVisibilityBaseSystem,-FontVisibilityLangPack"
 			},
 			"privacy.fingerprintingProtection.pbmode": {
 				"Comment": "Preference not allowed for stability reasons. :(",