Chronology Clock

Each minute on the clock is also a year. Find out what occurred in world history during that year. Why can this extension "read my browsing history"? It requires the "tabs" permission in order to detect when you open a new tab. The same permission could also allow an extension to log every URL you visit. If you have doubts, you can turn on developer mode and inspect the service worker (5 lines of code).

Screenshots from Chrome Web Store