Examine source code of LeetCode Classic

{
  "name": "LeetCode Classic",
  "description": "A browser extension to view LeetCode problems in old UI",
  "version": "1.1.1",
  "manifest_version": 3,
  "action": {
    "default_popup": "src/popup/popup.html",
    "default_title": "LeetCode Classic"
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "host_permissions": [
    "https://leetcode.com/*"
  ],
  "permissions": [
    "webNavigation",
    "storage"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "leetcode-classic-extension-@chandrakishorsingh.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "142.0"
    }
  }
}