Examine source code of Ctrl+Enter Sender

{
  "manifest_version": 2,
  "name": "Ctrl+Enter Sender",
  "version": "2.0.1",
  "description": "Enterで改行、Ctrl+Enterで送信に変更。チャットサービスでの誤送信を防止します。",
  "author": "minougun",
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ctrl-enter-sender@minougun",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://chatgpt.com/*",
        "https://chat.openai.com/*"
      ],
      "js": [
        "content/utils.js",
        "content/chatgpt.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*/*"
      ],
      "exclude_matches": [
        "https://chatgpt.com/*",
        "https://chat.openai.com/*"
      ],
      "js": [
        "content/utils.js",
        "content/universal.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/icon48.png",
      "96": "icons/icon96.png"
    }
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  }
}