diff --git a/netwerk/base/public/nsIProtocolProxyService.idl b/netwerk/base/public/nsIProtocolProxyService.idl
index 959d28fc3ae..23c5ca79306 100644
--- a/netwerk/base/public/nsIProtocolProxyService.idl
+++ b/netwerk/base/public/nsIProtocolProxyService.idl
@@ -33,6 +33,8 @@
 [scriptable, uuid(495CC980-E0D4-11d3-A1A8-0050041CAF44)]
 interface nsIProtocolProxyService : nsISupports
 {
+    readonly attribute PRBool proxyEnabled;
+
     void examineForProxy(in nsIURI aURI, in nsIProxy aProxy);
 };