Examine source code of CleanYT

{
  "manifest_version": 2,
  "name": "CleanYT",
  "version": "1.0",
  "description": "Clean the youtube video page.",
  "icons": {
    "48": "icons/logo-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/watch?*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/logo-32.png",
    "default_title": "CleanYT",
    "default_popup": "popup/index.html"
  },
  "permissions": [
    "storage"
  ],
  "author": "João Lima"
}