1. Please don't store any instance of objects in a property in the default class you are exporting (line 26 `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) you can clean up on: ```js window.connect('close-request', () => { // clean up here }); ``` 2. Timeout should be removed on destroy (line 149 `vitals.js`): [EGO Review Guidelines: Timeout](https://gjs.guide/extensions/review-guidelines/review-guidelines.html#remove-main-loop-sources)

Thanks for catching these issues! Regarding the first, does that apply to the extension as well, or only the preferences window?

You mean there is something in `extension.js` that needs to be cleaned up on disable?