The original Zotero also died with the demise of XUL extensions. It, too, used to be a Firefox extension.
Re:Firefox 57.0 Released
by TuringTest on Tuesday November 14, 2017 @04:59PM
(#15699584)
Zotero can also be installed as a stand-alone application, independent of the Firefox version
I wanted to suggest Zotero as a tool to capture information of different kinds. It’s a multi-platform tool that also has “connectors” (extensions) for different browsers. [1] It may probably not be a complete replacement for ScrapBook.
[1]: https://www.zotero.org/download/