Bug 1131136 part B - reload plugins when we load the plugins pane of the addon manager, r=Unfocused

--HG--
extra : rebase_source : af6134a6d4f194a0e890e6e179bfd8dc09285615

toolkit/mozapps/extensions/content/extensions.js

@@ -2597,6 +2597,10 @@ var gListView = {
     while (this._listBox.itemCount > 0)
       this._listBox.removeItemAt(0);
 
+    if (aType == "plugin") {
+      navigator.plugins.refresh(false);
+    }
+
     var self = this;
     getAddonsAndInstalls(aType, function show_getAddonsAndInstalls(aAddonsList, aInstallsList) {
       if (gViewController && aRequest != gViewController.currentViewRequest)