Examine source code of Image Grab

{
  "manifest_version": 3,
  "name": "ImageGrab",
  "description": "Quickly save images from any webpage",
  "version": "1.0.2",
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg",
    "128": "icon.svg"
  },
  "permissions": [
    "downloads",
    "contextMenus",
    "activeTab",
    "scripting",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{30f41d2a-7d16-40be-8400-1329a834e65a}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/image-scraper.js"
      ]
    }
  ]
}