This add-on works entirely inside Thunderbird on your computer. It does not send any data to the internet or to the developer and contains no tracking, analytics or advertising. It reads your Thunderbird calendar events only to display them and to carry out the actions you trigger (open, hide, export, delete). Settings are stored locally in Thunderbird. ICS files (exports and automatic backups before deleting) are written only to your local downloads folder. Events are deleted only after you explicitly confirm it.