Examine source code of esm.sh

{
  "name": "esm.sh extension",
  "description": "Add a \"Copy esm.sh import\" button on npm package pages",
  "homepage_url": "https://github.com/ghostdevv/esm.sh-extension",
  "version": "1.0.1",
  "manifest_version": 3,
  "icons": {
    "16": "./icons/16.png",
    "19": "./icons/19.png",
    "38": "./icons/38.png",
    "48": "./icons/48.png",
    "128": "./icons/128.png"
  },
  "content_scripts": [
    {
      "run_at": "document_idle",
      "matches": [
        "*://npmjs.com/package/*",
        "*://www.npmjs.com/package/*"
      ],
      "js": [
        "./dist/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{420fe7c2-79ec-4ee0-bd71-26808cfff90a}"
    }
  }
}