Examine source code of FullPageRoll - Full Page Screen Capture

{
  "manifest_version": 3,
  "name": "FullPageRoll - Full Page Screen Capture",
  "short_name": "FullPageRoll",
  "version": "1.7.17",
  "description": "Capture an entire webpage in one click and save it as an HD PNG or a continuous single-page PDF. Everything stays on your device.",
  "permissions": [
    "activeTab",
    "scripting",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fullpageroll@fullpageroll.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "FullPageRoll - Full Page Screen Capture",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/action-icon-toolbar-16.png",
      "32": "icons/action-icon-toolbar-32.png"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "Command+Shift+Y"
      },
      "description": "Capture the full page with FullPageRoll"
    }
  }
}