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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "TCR Tool Teacher",
  "version": "1.0",
  "description": "Quick access to TCR links for teachers (software development)",
  "permissions": [],
  "author": "Bram van Dijke",
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png",
      "48": "icon.png",
      "128": "icon.png"
    },
    "default_title": "TCR Tool Teacher"
  }
}