We take the privacy of our users very seriously. And the Turn Off the Lights Firefox extension does not collect anything from you. Because there is no Google Analytic script inside the extension file.
What you said is for the www.turnoffthelights.com website (as it stated on the privacy page -> topic "website").
This analytic data is anonymously collected with the Google Analytics script, to improve the website and the web page performance (find a web page that is loading slow). Furthermore, we know when there is a big group of visitors is reading our website (for an example in the morning). And what web browser do our visitors use to see our website. It is the same here for Mozilla Firefox addons gallery, they use also the Google Analytics script.
If you need any help or have feedback for us. Don't hesitate to contact us on the official support form: