Upon the first run, without warning, I see this: "If you read this, all of your cookies that are not currently in use just self-destructed. Don't panic. You can undo this if you prefer to keep them for now." . . . "Undeletes happen in batches. If you had a lot of cookies, you might need to restore more batches. Click SDC's icon again. Select Undelete (more) cookies from the menu. Repeat this until you get a notification stating that No more undeletes are possible."
Couldn't the extension have simply asked me once before proceeding with the delete in the first run? Basic usability.