Examine source code of Substack Insights

{
  "manifest_version": 3,
  "name": "Substack Insights (Unofficial)",
  "version": "1.1.0",
  "description": "Unofficial analytics tool for Substack creators. Analyze your publication's performance with local, privacy-first data processing. Not affiliated with Substack.",
  "homepage_url": "https://substackinsights.com",
  "permissions": [
    "cookies",
    "storage",
    "downloads"
  ],
  "host_permissions": [
    "https://*.substack.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "sidebar_action": {
    "default_panel": "sidepanel/index.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "action": {
    "default_title": "Open Substack Insights",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "dashboard/dashboard.html",
        "dashboard/dashboard.css",
        "dashboard/dashboard.js",
        "jszip.min.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "substack-insights@substackinsights.com",
      "strict_min_version": "128.0"
    }
  }
}