Examine source code of Full Page Screenshot

{
  "manifest_version": 3,
  "name": "Full Page Screenshot",
  "version": "1.0.2",
  "description": "Capture full page screenshots and edit with powerful image editor",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a3c7f3cd-89b7-4b26-bc3e-318d9ff81263}"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}