None, your data is yours and we do not want it. The extension does not collect any data. It never communicates in any form over the network.
Any options you may set in the Settings tab are saved, so that they don't get lost when you close and re-open your browser.
Since we don't collect any information on you, we also cannot notify you of changes to this privacy policy. To receive updates, please subscribe to this repository on Github.
You can ask questions by filing an issue in the issue tracker on GitHub.