Fixes #7. Cliget no longer breaks external view source.

lib/main.js

@@ -275,18 +275,21 @@ exports.main = function() {
 
 var contractId = '@mozilla.org/uriloader/external-helper-app-service;1';
 
-// Implement the service by subclassing Unknown
+// Implement a wrapper around external helper app service
 var DownloadHelper = Class({
   extends: Unknown,
-
-  interfaces: ['nsIExternalHelperAppService'],
-
   get wrappedJSObject() this,
 
-  originalService: Cc[contractId].getService(Ci.nsIExternalHelperAppService),
+  originalService: Cc[contractId].getService(),
 
-  applyDecodingForExtension: function(aExtension, aEncodingType) {
-    return this.originalService.applyDecodingForExtension(aExtension, aEncodingType);
+  QueryInterface: function(interface) {
+    var srv = this.originalService.QueryInterface(interface);
+    for (let i in srv)
+      if (!(i in this))
+        this[i] = function() {
+          return srv[i].apply(srv, arguments);
+        };
+    return this;
   },
 
   doContent: function(aMimeContentType, aRequest, aWindowContext, aForceSave) {
@@ -295,7 +298,8 @@ var DownloadHelper = Class({
 
     if (recentChannels.length >= 10)
       recentChannels.splice(0, recentChannels.length - 10);
-    return this.originalService.doContent(aMimeContentType, aRequest, aWindowContext, aForceSave);
+    return this.originalService.QueryInterface(Ci.nsIExternalHelperAppService)
+      .doContent(aMimeContentType, aRequest, aWindowContext, aForceSave);
   }
 });