Folder Filter Scheduler does not collect, transmit, sell, or share any data. All processing happens locally inside Thunderbird on the user's device. To evaluate the rules a user creates, it reads message headers (and, when a rule requires it, the full message) from the folders the user selects, solely to determine whether a message matches and to perform the configured action. It makes no network requests, contacts no servers, and contains no analytics or telemetry. Rule configuration is stored only in Thunderbird's local extension storage and is removed on uninstall. The requested permissions are used exclusively for these purposes.