manifest.json

{
  "description": "Allows you to view documents and other files online with the google docs viewer.",
  "manifest_version": 2,
  "name": "Google Docs Viewer",
  "version": "1.1",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "{a734ba68-4aac-41e0-9141-9f8d00373d93}",
      "strict_min_version": "54.0"
    }
  },

  "permissions": [
    "webRequest", "webRequestBlocking", "*://*/*", "tabs", "contextMenus", "downloads", "storage"
  ],

  "background": {
    "scripts": ["background.js"]
  },

  "content_scripts": [{
    "matches": [
      "https://docs.google.com/viewer?url=*&fext=*",
      "https://docs.google.com/viewerng/viewer?url=*&fext=*"
    ],
    "js": ["viewer.js"],
    "run_at": "document_start"
  }, {
    "matches": ["*://*/*"],
    "exclude_matches": [
      "https://docs.google.com/*",
      "https://content.googleapis.com/*",
      "https://clients6.google.com/*",
      "https://accounts.google.com/*",
      "https://*.googleusercontent.com/*"
    ],
    "js": ["content.js"],
    "run_at": "document_start",
    "all_frames": true
  }],

  "options_ui": {
    "page": "options.html",
    "browser_style": false
  }
}