Essential session data
Authentication cookies or equivalent session identifiers are required for signed-in features. They are used to associate browser requests with the correct authenticated session.
Local preferences
The interface may use localStorage for language, UI preferences, drafts, feature settings, and limited client-side state. These values help the interface behave consistently between visits.
Managing storage
Clearing site data in your browser signs you out and can remove local preferences or drafts. Server-side account and message data is not removed merely by clearing browser storage.