Page Wallpaper does not collect, transmit, sell, or share personal,
technical, or usage data. The add-on contains no analytics, tracking, or
advertising services and makes no network connections to first-party or
third-party servers.

The background image selected by the user and all preferences are stored only
in Firefox's local extension storage (storage.local). The image is rendered in
a closed extension layer and is not placed on a page element as a readable CSS
background property.

Selecting Remove image deletes the stored image from local extension storage.
When the add-on is uninstalled, Firefox removes its associated local extension
storage.