Examine source code of Leetcode Calendar

{
  "version": "1.4.0",
  "manifest_version": 3,
  "name": "Leetcode Calendar",
  "description": "A web extension that displays your leetcode submission history as a heatmap/calendar every time you open a new tab!",
  "chrome_url_overrides": {
    "newtab": "src/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "charlieweinberger05@gmail.com",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://leetcode.com/graphql",
    "https://api.resend.com/emails"
  ],
  "action": {
    "default_icon": {
      "32": "icons/icon-32.png"
    }
  },
  "icons": {
    "32": "icons/icon-32.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "web_accessible_resources": [
    {
      "matches": [],
      "resources": [
        "icons/icon-32.png",
        "icons/icon-96.png",
        "icons/icon-128.png"
      ]
    }
  ],
  "chrome_settings_overrides": {
    "homepage": "src/index.html"
  }
}