Examine source code of ChatGPT Token Counter

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "2.0.0",
  "icons": {
    "16": "icon/16.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "default_locale": "en",
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    "fonts/*",
    "content-scripts/content.css"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Chatgpt Token Counter",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://chatgpt.com/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{10db5bfc-54c9-48ff-bb95-1fa6209ffd1a}"
    }
  }
}