Examine source code of G-Script - Scriptwriting in Google Docs

{
  "name": "G-Script",
  "description": "This extension helps with the script writing",
  "version": "3.3",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{8a7d13d7-95b4-4576-8db3-d64639a1ceef}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "16.png",
    "48": "48.png",
    "128": "128.png"
  },
  "browser_action": {
    "default_title": "G-Script",
    "default_popup": "index.html",
    "default_icon": {
      "16": "16.png",
      "48": "48.png",
      "128": "128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "*://docs.google.com/document/d/*",
        "*://classroom.google.com/*"
      ],
      "run_at": "document_start",
      "all_frames": false,
      "match_about_blank": true,
      "css": [
        "assets/css/style.css",
        "assets/css/fonts.css"
      ],
      "js": [
        "content.js"
      ]
    },
    {
      "matches": [
        "http://www.google.com/robots.txt*"
      ],
      "js": [
        "./gauth.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://app.g-script.org/extension-auth*"
      ],
      "js": [
        "extension-auth-bridge.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "page": "background.html",
    "persistent": false
  },
  "permissions": [
    "identity",
    "activeTab",
    "storage",
    "alarms",
    "*://app.g-script.org/*",
    "*://auth.g-script.org/*"
  ],
  "content_security_policy": "script-src 'self' https://app.g-script.org/ https://auth.g-script.org/; object-src 'self'; frame-src https://app.g-script.org/; ",
  "web_accessible_resources": [
    "assets/css/style.css",
    "assets/css/fonts.css",
    "assets/css/fonts/OpenSauceSans-Black.ttf",
    "assets/css/fonts/OpenSauceSans-BlackItalic.ttf",
    "assets/css/fonts/OpenSauceSans-Bold.ttf",
    "assets/css/fonts/OpenSauceSans-BoldItalic.ttf",
    "assets/css/fonts/OpenSauceSans-ExtraBold.ttf",
    "assets/css/fonts/OpenSauceSans-ExtraLight.ttf",
    "assets/css/fonts/OpenSauceSans-Italic.ttf",
    "assets/css/fonts/OpenSauceSans-Light.ttf",
    "assets/css/fonts/OpenSauceSans-LightItalic.ttf",
    "assets/css/fonts/OpenSauceSans-Medium.ttf",
    "assets/css/fonts/OpenSauceSans-MediumItalic.ttf",
    "assets/css/fonts/OpenSauceSans-Regular.ttf",
    "assets/css/fonts/OpenSauceSans-SemiBold.ttf",
    "assets/css/fonts/OpenSauceSans-SemiBoldItalic.ttf",
    "assets/imgs/icons/arrow-left.svg",
    "auth-callback.html"
  ]
}