YouTube Auto Volume Changer

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "YouTube Auto Volume Changer",
  "version": "0.2.0",
  "manifest_version": 2,
  "description": "広告再生やプレミア公開のカウントダウン時に自動で音量を変更し、終了時に元の音量に戻します",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}