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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Image ratio preview",
  "action": {},
  "manifest_version": 3,
  "version": "0.1",
  "description": "Check image ratio in context menu.",
  "permissions": [
    "contextMenus"
  ],
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "128": "icons/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "service_worker": "background.js"
  }
}