Examine source code of Image Extractor

{
  "manifest_version": 3,
  "name": "Image Extractor",
  "version": "1.0.21",
  "author": "Mr.Manit Treeprapankit",
  "description": "Extract images and display in new tab",
  "icons": {
    "16": "icons/icon-16x16.png",
    "32": "icons/icon-32x32.png",
    "48": "icons/icon-48x48.png",
    "64": "icons/icon-64x64.png",
    "128": "icons/icon-128x128.png"
  },
  "content_scripts": [
    {
      "js": [
        "content-script.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "webRequest"
  ],
  "action": {
    "default_icon": "icons/icon-32x32.png",
    "default_title": "Image Extractor"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "image_extractor@8columns.com"
    }
  }
}