Examine source code of Shipped.io

{
  "name": "__MSG_extName__",
  "short_name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "1.5.10",
  "manifest_version": 2,
  "default_locale": "en",
  "background": {
    "scripts": [
      "libs/jquery-3.4.1.min.js",
      "libs/ga.js",
      "js/background.js",
      "js/gaConfig.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "img/icon-send16.png",
      "24": "img/icon-send24.png",
      "32": "img/icon-send32.png"
    },
    "default_title": "__MSG_extPopupName__",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "img/icon-send16.png",
    "48": "img/icon-send48.png",
    "128": "img/icon-send128.png"
  },
  "content_scripts": [
    {
      "all_frames": false,
      "matches": [
        "https://www.amazon.com/*",
        "http://www.amazon.com/*",
        "http://amazon.com/*",
        "https://amazon.com/*"
      ],
      "css": [
        "css/content.css",
        "css/buttons.css"
      ],
      "js": [
        "libs/jquery-3.4.1.min.js",
        "libs/ga.js",
        "libs/bootstrap/js/popper.min.js",
        "libs/bootstrap/js/bootstrap.min.js",
        "js/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "permissions": [
    "tabs",
    "http://*/",
    "https://*/",
    "storage",
    "activeTab",
    "webNavigation",
    "alarms",
    "notifications"
  ],
  "web_accessible_resources": [
    "*.png"
  ]
}