Kemet Privacy Policy

Last updated: November 2, 2026

Kemet is a browser extension that blocks malvertisements, scam popups and redirects, and ads on websites, including YouTube, Twitch, Kick and Google Search. This policy explains what data Kemet handles.

1. Summary

Kemet does not collect, sell, rent or share your personal information. Everything Kemet does runs on your computer. The only data that leaves your computer is described in section 3, and it cannot identify you or the videos you watch.

2. Data stored on your computer

Kemet saves its settings and a per-browser-session count of blocked items in your browser's local extension storage. This includes your on/off switches, the list of sites where you turned protection off, and the number of blocks in the current browser session. This data never leaves your computer, and it is erased when you remove Kemet or close the browser session (for the session count).

3. Sponsor-segment lookup (YouTube)

When "Skip sponsor segments" is turned on and you watch a YouTube video, Kemet asks the SponsorBlock service (sponsor.ajay.app) for timestamps of sponsored sections. To do this, Kemet computes a SHA-256 hash of the YouTube video ID and sends only the first four characters of that hash. The full video ID is never sent, so SponsorBlock cannot tell which video you are watching. Your IP address is visible to SponsorBlock as with any website request. SponsorBlock's own privacy policy applies to that service.

4. Information we do not collect

Kemet does not collect your browsing history, the pages you visit, search terms, form data, passwords, or any account information. Kemet has no accounts, analytics, advertising identifiers or tracking of its own.

5. Permissions

Kemet asks for browser permissions only to do the jobs described above: blocking requests to ad and malvertising servers, hiding ads on pages, stopping popups and redirects, saving your settings, and updating the blocked-item count. Kemet does not read or send the content of your pages to any server.

6. Third parties

Kemet uses EasyList filter lists (easylist.to) for blocking rules. These lists ship inside the extension and are not downloaded again. Sponsor-segment data comes from SponsorBlock, as described in section 3.

7. Children

Kemet does not knowingly collect information from anyone, including children under 13.

8. Changes to this policy

If this policy changes, the new version will be posted on this page with a new "Last updated" date.

9. Contact

Questions about this policy: [jesse6024@gmail.com]