GitHub's mascot is Octocat, a cute animal with the body of a octopus and the face of a cat. And in our turn, OctoX means "extending Octocat", which is what we are focusing on: improving your experience on GitHub.
I have no interest in your data at all. As developers, we all respect privacy and data. So no tracking code. No Google Analytics. Nothing is sent out of your browser from the extension. Your access tokens, your code, your discussions, all stay inside your browser. Your bookmarks are synchronized using your browser account and are never sent to our servers.