Privacy Policy for Codeforces Curtain

Last updated: August 30, 2026

Codeforces Curtain does not collect, transmit, or sell any personal data.

What the extension stores

• Codeforces handles that the user manually adds (up to 5).
• Cached lists of solved problems for those handles, fetched from the public Codeforces API (https://codeforces.com/api/user.status).

Where this data is stored

All data is stored locally on the user's device using the browser's built-in extension storage (chrome.storage.local). It is never sent to any server controlled by the developer, and is not shared with any third party.

What the extension accesses

• The Codeforces problemset page (codeforces.com/problemset), only when the user clicks "Execute" in the extension popup, to hide rows for already-solved problems.
• The public Codeforces API, to fetch solved-problem data for user-added handles.

Data removal

Users can remove any added handle (and its cached data) directly from the extension popup. Uninstalling the extension removes all locally stored data.

Changes to this policy

If this policy changes, the updated version will be posted at this same URL with a revised "Last updated" date.