diff --git a/netwerk/base/src/nsProxyAutoConfig.js b/netwerk/base/src/nsProxyAutoConfig.js
index a317e82ae71d..eb9df4c61376 100644
--- a/netwerk/base/src/nsProxyAutoConfig.js
+++ b/netwerk/base/src/nsProxyAutoConfig.js
@@ -128,6 +128,7 @@ nsProxyAutoConfig.prototype = {
             ProxySandBox.myIP = "127.0.0.1";
         }
         ProxySandBox.dnsResolve = dnsResolve;
+        ProxySandBox.alert = proxyAlert;
         LocalFindProxyForURL=ProxySandBox.FindProxyForURL;
         this.done = true;
     },
@@ -138,6 +139,16 @@ nsProxyAutoConfig.prototype = {
     }
 }
 
+function proxyAlert(msg) {
+    try {
+        var cns = Components.classes["@mozilla.org/consoleservice;1"]
+                            .getService(Components.interfaces.nsIConsoleService);
+        cns.logStringMessage("PAC-alert: "+msg);
+    } catch (e) {
+        dump("PAC: proxyAlert ERROR: "+e+"\n");
+    }
+}
+
 // Synchronous calls to nsDNSService::Resolve ignore the cache! (bug 97097)
 // Keep a simple one of our own.
 var dnsResolveCachedHost = null;