The last Firefox (Quantum) could not maintain back-compatibility for some add-ons (to understand the reason, see an explanation, but it's not needed for answering the question).
The Scrapbook extension was one of the add-ons to go. And as it appear, it won't come back any time soon.
For those who didn't know the extension, it was basically a way of saving web-pages or scraps of them. You got a left column with a list of scraps (similar to a list of bookmarks), that you could navigate through offline, and also annotate them. You could highlight parts of the scraps. That is, it was like taking notes of bits of information that you were reading online, and you could work further on them. Besides annotating, you could also organize them in folders, change names easily, delete bits of them.
Anyway, is there any software, not necessarily as an Firefox extension, that could provide the same functionality?
Maybe it would be even better to get a tool that's independent of any browser.