Thank you for your review. Unfortunately, Firefox's implementation of the WebExtensions API only allows saving to files within or below the configured download directory. If you want the Page Saver image files to go to your desktop, you will need to change your downloads directory within your Firefox preferences.

Scrolling to capture an "entire page" image is clearly not as good as grabbing the entire page without scrolling. When we created Page Saver WE, it was not possible to capture without scrolling. However, recently Mozilla has made additional canvas APIs available to WebExtensions which may allow us to avoid scrolling in the future.