Examine source code of 12ftladder

{
  "manifest_version": 2,
  "name": "12ftladder",
  "version": "1.0",
  "description": "Redirects paywalled articles to 12ftladder.com",
  "background": {
    "scripts": [
      "index.js"
    ],
    "persistent": false,
    "type": "module"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": {
      "32": "favicon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1b94bf5c-799e-4e23-83fd-cef85e89b2e2}"
    }
  }
}