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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Cool Symbols",
  "description": "On this extension you will get almost all kinds of cool symbols that can be used in social media platform.",
  "version": "1.1",
  "manifest_version": 3,
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/icon-16.png",
      "32": "/images/icon-32.png",
      "48": "/images/icon-48.png",
      "128": "/images/icon-128.png"
    }
  },
  "icons": {
    "16": "/images/icon-16.png",
    "32": "/images/icon-32.png",
    "48": "/images/icon-48.png",
    "128": "/images/icon-128.png"
  }
}