Examine source code of Dislike Count for LeetCode

{
  "manifest_version": 3,
  "name": "Dislike Count for LeetCode",
  "description": "Restores the hidden dislike count on LeetCode.",
  "homepage_url": "https://github.com/nex-54/Dislike-Count-For-LeetCode",
  "version": "1.5.0",
  "minimum_chrome_version": "111",
  "browser_specific_settings": {
    "gecko": {
      "id": "dislike-count-for-leetcode@nex-54.github.io",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_icon": {
      "16": "icons/16.png",
      "48": "icons/48.png",
      "128": "icons/128.png"
    },
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "https://leetcode.com/*"
      ]
    },
    {
      "js": [
        "inject.js"
      ],
      "matches": [
        "https://leetcode.com/*"
      ],
      "world": "MAIN"
    }
  ]
}