Examine source code of YouTube No Chat

{
  "author": "madalinul.dev@gmail.com & fyrewulf",
  "name": "YouTube No Chat",
  "description": "Automatically hides YouTube live chat by default",
  "version": "1.0.1",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "64": "icon64.png",
    "128": "icon128.png",
    "256": "icon256.png"
  },
  "manifest_version": 2,
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "*://www.youtube.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "youtube-no-chat@extension",
      "strict_min_version": "142.0"
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}