--- a/mobile/app/mobile.js
+++ b/mobile/app/mobile.js
@@ -76,16 +76,20 @@ pref("image.cache.size", 1048576); // by
 
 /* offline cache prefs */
 pref("browser.offline-apps.notify", true);
 pref("browser.cache.offline.enable", true);
 pref("browser.cache.offline.capacity", 5120); // kilobytes
 pref("offline-apps.quota.max", 2048); // kilobytes
 pref("offline-apps.quota.warn", 1024); // kilobytes
 
+/* protocol warning prefs */
+pref("network.protocol-handler.warn-external.tel", false);
+pref("network.protocol-handler.warn-external.mailto", false);
+
 /* http prefs */
 pref("network.http.pipelining", true);
 pref("network.http.pipelining.ssl", true);
 pref("network.http.proxy.pipelining", true);
 pref("network.http.pipelining.maxrequests" , 6);
 pref("network.http.keep-alive.timeout", 600);
 pref("network.http.max-connections", 6);
 pref("network.http.max-connections-per-server", 4);