Examine source code of Unified Docs Switcher

{
  "manifest_version": 2,
  "name": "Unified Docs Switcher",
  "description": "Automatically redirect to preferred documentation version for many projects",
  "author": "Doug Harris",
  "browser_specific_settings": {
    "gecko": {
      "id": "unified_docs_switcher@dougharris.github.io",
      "strict_min_version": "53.0"
    }
  },
  "version": "1.0.4",
  "icons": {
    "48": "books48.png",
    "128": "books.png"
  },
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "books.png",
    "default_title": "Doc Switcher",
    "default_popup": "popup/switcher-popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://docs.celeryq.dev/*",
        "https://docs.djangoproject.com/*",
        "https://docs.python.org/*",
        "https://docs.wagtail.org/*",
        "https://www.postgresql.org/docs/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "content-script.js"
      ],
      "css": [
        "doc-switcher.css"
      ]
    }
  ],
  "permissions": [
    "https://docs.celeryq.dev/*",
    "https://docs.djangoproject.com/*",
    "https://docs.python.org/*",
    "https://docs.wagtail.org/*",
    "https://www.postgresql.org/docs/*",
    "webRequest",
    "webRequestBlocking",
    "storage"
  ]
}