Examine source code of Leetion - LeetCode to Notion

{
  "manifest_version": 3,
  "name": "Leetion - LeetCode to Notion",
  "version": "1.1.5",
  "description": "Save LeetCode problems and solutions directly to your Notion database.",
  "browser_specific_settings": {
    "gecko": {
      "id": "neel@leetion.com",
      "strict_min_version": "112.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "scripting",
    "alarms",
    "notifications"
  ],
  "host_permissions": [
    "https://leetcode.com/*",
    "https://leetcode.cn/*",
    "https://api.notion.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "19": "icons/icon19.png",
      "32": "icons/icon32.png",
      "38": "icons/icon38.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Leetion - Save to Notion"
  },
  "content_scripts": [
    {
      "matches": [
        "https://leetcode.com/problems/*",
        "https://leetcode.cn/problems/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "onboarding.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  }
}