Examine source code of Easy Notes Maker

{
  "name": "Easy Notes Maker",
  "version": "1.0.0",
  "manifest_version": 2,
  "icons": {
    "16": "East.png",
    "48": "East.png",
    "128": "East.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "node_modules/@webcomponents/custom-elements/custom-elements.min.js",
        "content.js",
        "working.js"
      ]
    }
  ]
}