Cookie Library · Essential
xs
Part of the secret that keeps you signed in. Anyone holding it holds your session, which is why Sessyn’s analysis never reads cookie values, and Export Cookies warns you before it copies them.
- Owner
- Meta Platforms, Inc.
- Matches
- The exact name
xs - Needed to Work
- Yes. Removing it can sign you out or break the site.
- Confidence
- Verified
- Source
- https://www.facebook.com/privacy/policies/cookies/?annotations[0]=explanation%2F1_common_cookies_and_uses
- Last Reviewed
- 2026-09-14
Which Sites
Only on facebook.com, messenger.com and their subdomains. The same name on another site is a different cookie, and is not described here.