Examine source code of Image Grab

{
  "manifest_version": 3,
  "name": "ImageGrab",
  "description": "Quickly save images from any webpage",
  "version": "1.1.0",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "downloads",
    "contextMenus",
    "activeTab",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "commands": {
    "open-batch-modal": {
      "suggested_key": {
        "default": "Alt+Shift+I",
        "mac": "Alt+Shift+I"
      },
      "description": "Open ImageGrab Batch Downloader"
    }
  },
  "action": {
    "default_title": "ImageGrab",
    "default_icon": {
      "16": "icon-16.png",
      "32": "icon-32.png",
      "48": "icon-48.png",
      "128": "icon-128.png"
    },
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{30f41d2a-7d16-40be-8400-1329a834e65a}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/image-scraper.js"
      ]
    }
  ]
}