diff --git a/config/mozilla.cfg b/config/mozilla.cfg
index fc9f7e8..ccf72b0 100644
--- a/config/mozilla.cfg
+++ b/config/mozilla.cfg
@@ -577,7 +577,7 @@ lockPref("browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcut
 // Section : Miscellaneous
 // >>>>>>>>>>>>>>>>>>>>>>
 // Pref : Test mozilla.cfg in about:config
-lockPref("_config.applied", true); // [FENNEC]
+lockPref("_config.applied", true);
 // -------------------------------------
 // Pref : Updates addons automatically
 // https://blog.mozilla.org/addons/how-to-turn-off-add-on-updates/
@@ -2063,14 +2063,14 @@ lockPref("browser.ping-centre.telemetry", false); // [DESKTOP]
 // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 // Section : System add-ons / Experiments
 // >>>>>>>>>>>>>>>>>>>>
-// Pref : Disable System Add-on updates
+// Pref : Sanitize System Add-on updates URL
 // https://firefox-source-docs.mozilla.org/toolkit/mozapps/extensions/addon-manager/SystemAddons.html
 // https://blog.mozilla.org/data/2018/08/20/effectively-measuring-search-in-firefox/
 // https://github.com/pyllyukko/user.js/issues/419
 // https://dxr.mozilla.org/mozilla-central/source/toolkit/mozapps/extensions/AddonManager.jsm#1248-1257
 // [NOTE] Disabling system add-on updates prevents Mozilla from "hotfixing" your browser to patch critical problems (one possible use case from the documentation)
-lockPref("extensions.systemAddon.update.enabled", false); // [DESKTOP]
-lockPref("extensions.systemAddon.update.url", "");
+// lockPref("extensions.systemAddon.update.enabled", false); // [DESKTOP]
+lockPref("extensions.systemAddon.update.url", "https://aus5.mozilla.org/update/3/SystemAddons/%VERSION%/%BUILD_ID%/%BUILD_TARGET%/%CHANNEL%/%OS_VERSION%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/update.xml"); // [URL SANITIZED]
 // -------------------------------------
 // Pref : Disable Normandy/Shield
 // Shield is an telemetry system (including Heartbeat) that can also push and test "recipes"