GitHub - danny0838/firefox-scrapbook: ScrapBook X – a legacy Firefox add-on that captures web pages to local device for future retrieval, organization, annotation, and edit.
ScrapBook Plug-in for Firefox - Download
Alternatives to Firefox Quantum due to dropping of support for Add-ons like 'DownThemAll!' and 'ScrapBook'.
How do I open up the Scrapbook after saving something off the web in Firefox? - Super User