Examine source code of LeetHide CN

{
  "manifest_version": 2,
  "name": "LeetHide CN",
  "version": "1.0.1",
  "author": "Wee Hong KOH",
  "description": "An extension provides a button to toggle the visibility of the LeetCode Solution",
  "icons": {
    "48": "icons/leetcode.svg"
  },
  "browser_action": {
    "default_icon": "icons/leetcode.svg",
    "default_title": "LeetHide"
  },
  "content_scripts": [
    {
      "matches": [
        "*://leetcode.cn/problems/*"
      ],
      "js": [
        "plugin.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f820985a-507a-4782-bdca-41fb03fbf8d9}"
    }
  }
}