Examine source code of API Pages

{
  "manifest_version": 2,
  "name": "API Pages",
  "version": "1.1",
  "description": "Adds /api/pages/ to your URL and changes the port 3000 to 8000.",
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "API Pages"
  },
  "background": {
    "scripts": [
      "api-pages.js"
    ]
  }
}