Examine source code of Zen Auto Tab Closer

{
  "manifest_version": 2,
  "name": "Zen Auto Tab Closer",
  "version": "1.1.0",
  "description": "Automatically closes Zoom '#success' tabs (3s) and Slack thread tabs (10s). Minimal permissions for maximum security.",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{03eede0d-83df-4327-9821-4fe620231df7}"
    }
  }
}