diff --git a/browser/devtools/app-manager/content/manifest-editor.js b/browser/devtools/app-manager/content/manifest-editor.js
index 66cf7f734655..dd76c4e0be8a 100644
--- a/browser/devtools/app-manager/content/manifest-editor.js
+++ b/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;