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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "1.0.1",
  "manifest_version": 3,
  "name": "はてなブログ 未読数",
  "description": "はてなブログの購読リストの未読の記事の数を表示します",
  "action": {
    "default_icon": "images/icon38.png"
  },
  "background": {
    "service_worker": "service-worker-loader.js",
    "type": "module"
  },
  "permissions": [
    "webRequest",
    "tabs",
    "alarms"
  ],
  "host_permissions": [
    "https://blog.hatena.ne.jp/api/recent_subscribing"
  ],
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  }
}