Examine source code of Docs Online Viewer (fork)

{
  "description": "Open documents and files online directly in your browser using online services like Google Docs Viewer, etc.",
  "manifest_version": 2,
  "name": "Docs Online Viewer (fork)",
  "version": "1.1.5",
  "applications": {
    "gecko": {
      "id": "{b164be58-6bdd-41e0-9141-9f8d00373d93}",
      "strict_min_version": "73.0"
    }
  },
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "64": "icons/64.png"
  },
  "permissions": [
    "menus",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "content-disposition.js",
      "background.js"
    ]
  }
}