Examine source code of ChatSendKeyChanger

{
  "manifest_version": 2,
  "name": "ChatSendKeyChanger",
  "version": "1.1",
  "description": "ChatGPTのEnterを改行にするアドオンです",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://chat.openai.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d4600042-a1f7-42f3-8b56-2fe207a61e4c}"
    }
  }
}