Bug 926506 - Hide proto in Manifest Editor. r=paul

browser/devtools/app-manager/content/manifest-editor.js

@@ -42,6 +42,7 @@ ManifestEditor.prototype = {
 
     let editor = this.editor = new VariablesView(variablesContainer);
 
+    editor.onlyEnumVisible = true;
     editor.eval = this._onEval;
     editor.switch = this._onSwitch;
     editor.delete = this._onDelete;