diff --git a/browser/app/profile/firefox.js b/browser/app/profile/firefox.js
index d1613722b15..3a0536ec42e 100644
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -1090,7 +1090,7 @@ pref("devtools.commands.dir", "");
 // Enable the app manager
 pref("devtools.appmanager.enabled", true);
 pref("devtools.appmanager.lastTab", "help");
-pref("devtools.appmanager.manifestEditor.enabled", false);
+pref("devtools.appmanager.manifestEditor.enabled", true);
 
 // Toolbox preferences
 pref("devtools.toolbox.footer.height", 250);