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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "NumTabs",
  "description": "A chrome extension made to show the number of tabs you currently have open!",
  "version": "2.0.1",
  "manifest_version": 3,
  "background": {
    "service_worker": "background.js"
  },
  "action": {
    "default_icon": {
      "16": "/images/num_tabs16.png",
      "32": "/images/num_tabs32.png",
      "48": "/images/num_tabs48.png",
      "128": "/images/num_tabs128.png"
    }
  },
  "icons": {
    "16": "/images/num_tabs16.png",
    "32": "/images/num_tabs32.png",
    "48": "/images/num_tabs48.png",
    "128": "/images/num_tabs128.png"
  },
  "options_page": "options.html"
}