Examine source code of Mixpanel Data Inspector

{
  "manifest_version": 2,
  "name": "Mixpanel",
  "version": "2.7",
  "description": "",
  "icons": {
    "48": "icons/purple-x-48.png",
    "128": "icons/purple-x-128.png"
  },
  "browser_action": {
    "default_title": "Mixpanel"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox@mixpanel.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_security_policy": "script-src 'self';",
  "web_accessible_resources": [
    "index.html"
  ],
  "devtools_page": "devtools.html",
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "dist/content_isolated.js"
      ]
    },
    {
      "run_at": "document_start",
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "dist/content_page.js"
      ],
      "world": "MAIN"
    }
  ],
  "background": {
    "scripts": [
      "dist/background.js"
    ]
  }
}