Context
After T178438#3696251, @Elitre and I spent a little while debugging why Page Previews wasn't detecting that the NavPopups gadget was enabled. Per T178438#3696349, it turned out that the gadget was enabled in their global.js on metawiki.
AC
- The popups-prefs-conflicting-gadgets-info message explicitly mentions gadgets loaded via a user's global JS.