Examine source code of Google Photo Eraser

{
  "manifest_version": 2,
  "name": "Google Photo Eraser",
  "version": "1.11",
  "description": "An extension that allows you to quickly delete photos from Google Photos by pressing the Delete key.",
  "icons": {
    "48": "icons/eraser-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.photos.google.com/*"
      ],
      "js": [
        "eraser.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2f9be043-767e-4c15-9a6f-3cc981cf2e18}"
    }
  }
}