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I actually abandoned Scrapbook years ago for fear of the format not being portable. In truth, now I've got data all scattered around but at least I'm not in this position. You might want to look at Zim which is more of a "personal wiki" but at least fits _my_ workflow for Scrapbook with a bit more copy-paste. I hope that it fits yours as well.

Seems there is a port in work: https://github.com/danny0838/webscrapbook

I'm in the same boat, scrapbook is to me a must have and I'm going to be stuck on the older FF until it can be migrated. That's years of stuff in there.