Examine source code of Self-Destructing Cookies (WebEx)

{
  "manifest_version": 3,
  "version": "0.2.3",
  "name": "Self-Destructing Cookies",
  "description": "Delete cookies when browser is closed or once the tab is closed to prevent tracking",
  "permissions": [
    "storage",
    "cookies",
    "contextMenus",
    "notifications"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "256": "data/icons/256.png",
    "512": "data/icons/512.png"
  },
  "action": {},
  "background": {
    "service_worker": "worker.js",
    "scripts": [
      "mode/tab.js",
      "mode/session.js",
      "tld.js",
      "worker.js"
    ]
  },
  "options_ui": {
    "page": "data/options/index.html",
    "open_in_tab": true
  },
  "homepage_url": "https://add0n.com/self-destructing-cookies.html",
  "commands": {
    "_execute_action": {}
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ff257424-87c5-46d1-bebd-f45cc8d2a4bf}",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}