Examine source code of Full Page Screenshot - FullSnapper

{
  "manifest_version": 3,
  "name": "Full Page Screenshot - FullSnapper",
  "version": "0.7.4",
  "description": "Full page screenshots without scrolling. One shot, whole page.",
  "browser_specific_settings": {
    "gecko": {
      "id": "fullsnapper@fullsnapper.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "background": {
    "scripts": [
      "src/settings.js",
      "src/background.js"
    ]
  },
  "action": {
    "default_title": "FullSnapper: capture the whole page (Shift-click for the visible area)",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+P"
      },
      "description": "Capture the whole page"
    },
    "capture-visible": {
      "suggested_key": {
        "default": "Alt+Shift+V"
      },
      "description": "Capture only the visible area"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "options_ui": {
    "page": "src/options.html",
    "open_in_tab": true
  }
}