Examine source code of Save Website as Image

{
  "author": "igorlogius",
  "background": {
    "scripts": [
      "jszip.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_area": "navbar"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{e36d3d91-3bd1-496a-a9c3-d6b2e8fb792d}"
    }
  },
  "commands": {
    "_execute_browser_action": {}
  },
  "description": "Make full website snapshots",
  "homepage_url": "https://github.com/igorlogius/webextensions/tree/main/sources/save-website-as-image",
  "icons": {
    "128": "icon.png"
  },
  "manifest_version": 2,
  "name": "Save Website as Image",
  "permissions": [
    "activeTab",
    "<all_urls>",
    "downloads"
  ],
  "version": "1.4.30"
}