Not sure where this previous post got garbled but I meant to write that I do have all of the scrapbook data in text. It is not easy, finding a webpage doesn’t exist unless I do a keyword search and then I can see the text but really hard to wade through
OK, I have had PaleMoon, a FF variant, installed and had the scrapbook addon. It still can open all of my scrapbook saves. So an option would be to download and install PaleMoon and add the scrapbook addon. It should find your cache and open the pages as normal. If you, like me, want that addon but only with FF then yeah, downgrade as suggested. I can do it from my repos to FF45 or download an older version and run it alongside FF57.
I ended up uninstalling quantum and installed FF56 and that works.