1. Not a good practice (line 1 and 12 prefs.js). It's better to just export default class line 12. You have the same issue in extension.js (line 1, 29, 31, 33, 35) 2. Use a less generic name for the class you are exporting (for stack trace). 3. No need to return (line 580 extension.js). 4. Eveyrthing you store as `this.` in `VWLExtension` (line 35 extension.js), should be null out in disable. I recommend to move all othose methods to another class and just use enable and disable in the default class you are exporting. In that case, you don't need to null out too many properties. You can pass `this` to that class as dependency injection. 5. Use `this.openPreferences()` instead of spawn command (line 219 extension.js): https://gjs.guide/extensions/upgrading/gnome-shell-45.html#extensionutils 6. `var` is bad. Use `let` or `const` instead.