diff --git a/user.js b/user.js
index 6bd4244..b08549c 100644
--- a/user.js
+++ b/user.js
@@ -158,6 +158,16 @@ user_pref("privacy.trackingprotection.enabled", false);
 // -------------------------------------
 // Disable detailed error reporting of media errors for debugging purposes
 user_pref("media.sourceErrorDetails.enabled", false);
+// -------------------------------------
+// Disable handler urls
+user_pref("gecko.handlerService.schemes.mailto.0.uriTemplate", "");
+user_pref("gecko.handlerService.schemes.mailto.0.name", "");
+user_pref("gecko.handlerService.schemes.mailto.1.uriTemplate", "");
+user_pref("gecko.handlerService.schemes.mailto.1.name", "");
+user_pref("gecko.handlerService.schemes.irc.0.uriTemplate", "");
+user_pref("gecko.handlerService.schemes.irc.0.name", "");
+user_pref("gecko.handlerService.schemes.ircs.0.uriTemplate", "");
+user_pref("gecko.handlerService.schemes.ircs.0.name", "");
 //
 // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 // BLOCK IMPLICIT OUTBOUND [not explicitly asked for - e.g. clicked on]
@@ -1017,6 +1027,7 @@ user_pref("general.smoothScroll", false);
 // user_pref("browser.bookmarks.max_backups", 2);
 user_pref("network.manage-offline-status", false);
 // user_pref("xpinstall.signatures.required", false);
+user_pref("javascript.options.shared_memory", false);
 // -------------------------------------
 // Enable the <menuitem> html tag
 // user_pref("dom.menuitem.enabled", true);