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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "background": {
    "service_worker": "background.js"
  },
  "description": "Allows the user to collapse Trello lists. List setting is stored in extension storage.",
  "action": {
    "default_icon": {
      "128": "icon.png"
    }
  },
  "manifest_version": 3,
  "name": "Collapsible Trello Lists",
  "version": "1.1.11",
  "permissions": [
    "tabs",
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "*://trello.com/*"
  ]
}