Adding xpinstall notfication to the sidebar.

rdf/resources/flash-registry.rdf

@@ -12,6 +12,10 @@
 	  <!-- Messenger Flashes -->	 
       <RDF:Description about="rdf:msgnotifications" />
     </RDF:li>
+    <RDF:li>
+      <!-- XPInstall Flashes -->
+      <RDF:Description about="rdf:xpinstall-update-notifier" />
+    </RDF:li> 
   </RDF:Bag>
 
   <RDF:Bag about="NC:FlashStyleSheets">

rdf/resources/flash.css

@@ -15,3 +15,7 @@ treeitem[type="http://www.mozilla.org/RDF#TinderboxFlash"] > treerow > treecell
 treeitem[type="http://home.netscape.com/NC-rdf#MsgNewMessages"] > treerow > treecell > titledbutton {
   list-style-image: url("chrome://messenger/skin/folderHasMail.gif");
 }
+
+treeitem[type="http://www.mozilla.org/rdf#XPInstallNotification"] > treerow > treecell > titledbutton {
+  list-style-image: url("resource:/res/rdf/document.gif");
+}