Examine source code of Live Time Copier

{
  "manifest_version": 3,
  "name": "Live Time Copier",
  "version": "1.3.3",
  "description": "__MSG_extensionDescription__",
  "author": "Lumynous",
  "homepage_url": "https://github.com/lumynou5/live-time-copier",
  "default_locale": "en",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "clipboardWrite",
    "storage"
  ],
  "host_permissions": [
    "https://www.twitch.tv/*",
    "https://www.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.twitch.tv/*"
      ],
      "js": [
        "common.js",
        "twitch.js"
      ],
      "css": [
        "twitch.css"
      ]
    },
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "common.js",
        "youtube.js"
      ],
      "css": [
        "youtube.css"
      ]
    }
  ],
  "options_ui": {
    "page": "options_ui/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{F11091D0-F375-4943-B5BE-0E65A5416E16}"
    }
  }
}