1. I recommend to use `destroy()` instead of `_onDestroy()`. Then you can add `super.destroy()` at the end of that function. 2. You have [`.get_child()`](https://gjs-docs.gnome.org/gio20~2.0/gio.settings#method-get_child) that you can use instead (line 53, 61 `prefs.js`). Since you already have `this._settings`, you can use `this._settings.get_child('internal-shortcuts')` and `this._settings.get_child('drawing')` there instead. 3. Please don't store any instance of objects in a property in the default class you are exporting (line 45, 53, 61 `prefs.js`) that won't allow the garbage collector to do its job after window close: [EGO Review Guidelines: Destroy](https://gjs.guide/extensions/review-guidelines/review-guidelines.html#destroy-all-objects) If you don't want to make them local to `fillPreferencesWindow()` function, you can clean up on: ```js window.connect('close-request', () => { // clean up here }); ``` 4. For `donations`, if you want to use Patreon, just use the user handle: ```json "patreon": "ProwseTech" ``` [Extension Anatomy: donations](https://gjs.guide/extensions/overview/anatomy.html#donations)