This extension does not use any analytics or tracking. The source code for the extension can be seen and audited here — it is only 8 lines of code. When you explicitly click on the "Add to 1Feed" button in the extensions section of the browser toolbar, the extension will redirect you to the 1Feed web app, which may use forms of tracking such as Firebase Analytics. The only information shared to the 1Feed web app by the browser extension is the URL of the page you were on when you clicked the "Add to 1Feed" button, and the fact that you arrived at 1Feed via a browser extension.