Examine source code of YouTube Sidebar Toggle

{
  "manifest_version": 2,
  "name": "YouTube Sidebar Toggle",
  "version": "1.1",
  "description": "Toggle YouTube sidebar visibility.",
  "permissions": [
    "storage",
    "tabs",
    "https://www.youtube.com/*"
  ],
  "browser_action": {
    "default_title": "Toggle YouTube Sidebar",
    "default_icon": {
      "16": "icon-16.png",
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{41600fc3-6948-48e1-b041-05487ed5f667}"
    }
  }
}