Examine source code of YT Short2Vid

{
  "manifest_version": 2,
  "name": "YT Short2Vid",
  "version": "1.0",
  "description": "Modifies specific parts of YouTube URLs",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{65f9b0d9-c33c-4b47-9dd7-093d10ff23fe}"
    }
  }
}