Examine source code of KappaYT

{
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "jquery-3.2.0.min.js",
        "liveChatScripts.js"
      ]
    }
  ],
  "icons": {
    "16": "1.0.png",
    "48": "2.0.png",
    "128": "3.0.png"
  },
  "name": "KappaYT",
  "description": "Wyświetlanie emotikonek z twitch.tv na Live Chat w YouTube",
  "version": "1.1.1resigned1",
  "browser_action": {
    "16": "1.0.png",
    "48": "2.0.png",
    "128": "3.0.png"
  },
  "permissions": [
    "activeTab",
    "https://api.twitch.tv/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{77bd91c1-8898-49b3-b8ea-a845d318035a}"
    }
  }
}