1. Please remove `stylesheet.css` since you are not using it: [EGO Review Guidelines: unnecessary files](https://gjs.guide/extensions/review-guidelines/review-guidelines.html#don-t-include-unnecessary-files) 2. Please use aysnc for reading file content since you are in shell process (line 249 `extension.js`): [Gio.File.load_contents_async](https://gjs-docs.gnome.org/gio20~2.0/gio.file#method-load_contents_async) 3. Please don't store any instance of objects in a property in the default class you are exporting in `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 move them to another class or make them local to `fillPreferencesWindow()` function, you can clean up on: ```js window.connect('close-request', () => { // clean up here }); ``` If you need any help with your extension you can ask us on: - [GNOME Extensions Matrix Channel](https://matrix.to/#/#extensions:gnome.org) - IRC Bridge: irc://irc.gimpnet.org/shell-extensions