Bug 42774: Always hide the third-pary certs UI.

browser/components/preferences/privacy.js

@@ -488,7 +488,8 @@ var gPrivacyPane = {
     let canConfigureThirdPartyCerts =
       (AppConstants.platform == "win" || AppConstants.platform == "macosx") &&
       typeof Services.policies.getActivePolicies()?.Certificates
-        ?.ImportEnterpriseRoots == "undefined";
+        ?.ImportEnterpriseRoots == "undefined" &&
+      !AppConstants.BASE_BROWSER_VERSION;
 
     document.getElementById("certEnableThirdPartyToggleBox").hidden =
       !canConfigureThirdPartyCerts;