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1. `lookupByURL()` is a bad practice. You can use `this.getSettings()` instead (line 21 `extension.js`). 2. Dont' hold any instances after window close (line 10-15 `prefs.js`): [EGO Review Guidelines: Destroy](https://gjs.guide/extensions/review-guidelines/review-guidelines.html#destroy-all-objects) I recommend to make them local to `fillPreferencesWindow()` and pass them to the other methods and functions.