Examine source code of ChatGPT words/replies counter

{
  "manifest_version": 2,
  "name": "ChatGPT words/replies counter",
  "version": "1.0.3",
  "description": "Adds a number of words on the chatgpt page for tracking the current context length. After space, and the number of ChatGPT answers in the current dialog (for tracking limit of 25 answers per 3 hours for GPT4). Updates every 5 seconds",
  "permissions": [
    "https://chat.openai.com/*",
    "tabs",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://chat.openai.com/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{82e445ce-be33-400e-b5a2-9ec11e3e0218}"
    }
  }
}