Examine source code of YouTube Sidebar Remover

{
  "manifest_version": 2,
  "name": "YouTube Sidebar Remover",
  "version": "1.0.0",
  "description": "Removes YouTube's distracting sidebar with suggested videos for better focus",
  "permissions": [
    "storage",
    "https://*.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_title": "YouTube Sidebar Remover",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "applications": {
    "gecko": {
      "id": "youtube-sidebar-remover@sadeghizad",
      "strict_min_version": "78.0"
    }
  }
}