Examine source code of YouTube Chapter Navigator

{
  "manifest_version": 2,
  "name": "YouTube Chapter Navigator",
  "description": "Navigate YouTube video chapters with global keyboard shortcuts (Alt+. and Alt+,)",
  "version": "1.2.0",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "*://*.youtube.com/*",
    "tabs",
    "activeTab",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "injected.js"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/watch*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "commands": {
    "next-chapter": {
      "suggested_key": {
        "default": "Alt+Period"
      },
      "description": "Go to next chapter"
    },
    "prev-chapter": {
      "suggested_key": {
        "default": "Alt+Comma"
      },
      "description": "Go to previous chapter"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a7f3c91d-5e2b-48f6-b4d8-9c1a7e6f3b2d}",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}