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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Timer Pro",
  "version": "1.0.1",
  "description": "A simple chrome plugin timer.",
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "image/16x16.png",
      "24": "image/24x24.png",
      "32": "image/32x32.png"
    }
  },
  "icons": {
    "16": "image/16x16.png",
    "24": "image/24x24.png",
    "32": "image/32x32.png",
    "48": "image/48x48.png",
    "64": "image/64x64.png",
    "128": "image/128x128.png"
  },
  "permissions": [
    "storage",
    "notifications"
  ],
  "background": {
    "service_worker": "background.js"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "music/ringing01.mp3",
        "music/ringing02.mp3",
        "music/ringing03.mp3",
        "music/ringing04.mp3",
        "music/ringing05.mp3"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "options_page": "options.html"
}