Examine source code of saveto.me — Smart Bookmarks

{
  "manifest_version": 3,
  "name": "saveto.me — Personal Internet Library",
  "version": "1.2.0",
  "description": "Save the current page or any link to your private saveto.me library.",
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "action": {
    "default_title": "Save to saveto.me",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "service-worker.js"
    ]
  },
  "commands": {
    "save-current-page": {
      "suggested_key": {
        "default": "Alt+Shift+S",
        "mac": "Command+Shift+S"
      },
      "description": "Save the current page to saveto.me"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@saveto.me",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "websiteContent"
        ]
      }
    }
  }
}