Is CF Analytics safe?

CF Analytics fetches the viewed Codeforces profile's submission history via the public Codeforces API and renders problem-rating and tag charts locally.

When a user visits a Codeforces profile page, the extension calls the public codeforces.com API to retrieve that profile's submission history. All data processing happens locally in the browser: the extension builds bar and doughnut charts showing solved-problem ratings and topic tags, and lists unsolved problems. No data is transmitted to any third-party server.