Examine source code of Django DevBar

{
  "manifest_version": 3,
  "name": "Django DevBar",
  "version": "1.4.2",
  "description": "View Django DevBar metrics in browser DevTools: database queries, response times, and duplicate queries.",
  "homepage_url": "https://github.com/amureki/django-devbar",
  "devtools_page": "devtools.html",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "django-devbar@amureki.me",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "140.0"
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}