diff --git a/user.js b/user.js
index 773a759..162fbbb 100644
--- a/user.js
+++ b/user.js
@@ -966,6 +966,10 @@ user_pref("permissions.delegation.enabled", false);
 // string is restored if the tab reverts back to the original page. This change prevents some cross-site attacks ***/
 user_pref("privacy.window.name.update.enabled", true);
 // -------------------------------------
+// Pref: Disable bypassing 3rd party extension install prompts [FF82+]
+// https://bugzilla.mozilla.org/buglist.cgi?bug_id=1659530,1681331 ***/
+user_pref("extensions.postDownloadThirdPartyPrompt", false); // [DESKTOP]
+// -------------------------------------
 // Pref : Disable the default checkedness for "Save card and address to Firefox" checkboxes
 // https://bugzilla.mozilla.org/show_bug.cgi?id=1477106
 user_pref("dom.payments.defaults.saveAddress", false);