Line Numbers for Google Docs

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Line Numbers for Google Docs",
  "short_name": "Line Numbers",
  "description": "The simplest way to add line numbers to any Google Docs document",
  "author": "Pablo Gamito",
  "version": "2.1.3",
  "content_security_policy": "script-src 'self' https://www.googletagmanager.com https://ssl.google-analytics.com https://www.google-analytics.com https://apis.google.com https://www.gstatic.com/ https://*.firebaseio.com; object-src 'self'",
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon128.png",
    "default_popup": "popup.html"
  },
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://docs.google.com/document/d/*",
        "http://docs.google.com/document/d/*"
      ],
      "js": [
        "js/content.js"
      ],
      "all_frames": false
    }
  ],
  "permissions": [
    "https://docs.google.com/document/d/*",
    "http://docs.google.com/document/d/*",
    "https://linenumbers.app/*",
    "storage"
  ],
  "web_accessible_resources": [
    "css/linenumbering.css",
    "js/linenumbering.js",
    "js/metrics.js",
    "js/storage.js",
    "js/menu.js",
    "js/utils.js",
    "js/auth.js"
  ]
}