butterfly on your page

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manifest.json

{
  "manifest_version": 2,
  "name": "butterfly on your page",
  "version": "1.1",
  "web_accessible_resources": [
    "butterfly/*.jpg"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts.js"
      ]
    }
  ],
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}