--- mozilla/toolkit/mozapps/plugins/content/pluginInstallerDatasource.js.vendor	2008-05-28 20:49:33.000000000 +0200
+++ mozilla/toolkit/mozapps/plugins/content/pluginInstallerDatasource.js	2008-12-17 16:35:45.000000000 +0100
@@ -56,6 +56,8 @@
   var prefBranch = Components.classes["@mozilla.org/preferences-service;1"]
                              .getService(Components.interfaces.nsIPrefBranch);
   this.dsURI = prefBranch.getCharPref("pfs.datasource.url");
+  this.vendorSub = prefBranch.getCharPref("general.useragent.vendorSub");
+  this.vendorComment = prefBranch.getCharPref("general.useragent.vendorComment");
 }
 
 nsRDFItemUpdater.prototype = {
@@ -68,6 +70,8 @@
     dsURI = dsURI.replace(/%APP_RELEASE%/g, this.appRelease);
     dsURI = dsURI.replace(/%CLIENT_OS%/g, this.clientOS);
     dsURI = dsURI.replace(/%CHROME_LOCALE%/g, this.chromeLocale);
+    dsURI = dsURI.replace(/%VENDOR_SUB%/g, this.vendorSub);
+    dsURI = dsURI.replace(/%VENDOR_COMMENT%/g, this.vendorComment);
 
     var ds = this._rdfService.GetDataSource(dsURI);
     var rds = ds.QueryInterface(Components.interfaces.nsIRDFRemoteDataSource)