Examine source code of Track & Trace Parcels

{
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "manifest_version": 2,
  "version": "2.1.1",
  "homepage_url": "https://tracktrace.delivery/?utm_campaign=tracktrace_extension&utm_source=extension&utm_medium=about",
  "content_scripts": [
    {
      "matches": [
        "https://tracktrace.delivery/*"
      ],
      "css": [
        "css/injection.css"
      ],
      "js": [
        "js/tt_injection.js"
      ]
    }
  ],
  "externally_connectable": {
    "matches": [
      "https://tracktrace.delivery/*"
    ]
  },
  "permissions": [],
  "browser_action": {
    "default_icon": {
      "16": "icons/16x16.png",
      "32": "icons/32x32.png",
      "48": "icons/48x48.png",
      "128": "icons/128x128.png"
    },
    "default_title": "Track & Trace Parcels. Search Tab",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/16x16.png",
    "32": "icons/32x32.png",
    "48": "icons/48x48.png",
    "128": "icons/128x128.png"
  },
  "background": {
    "scripts": [
      "js/tt_background.js"
    ]
  },
  "web_accessible_resources": [
    "icons/*",
    "js/*"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "content_security_policy": "script-src 'self' 'sha256-XVrX+tDHWh+zHR9vr3L4hLXLMIyQZmt9G7mmXdFiJPQ='; object-src 'none'"
}