Lack of Scrapbook Integration Rated 4 out of 5 stars
When the page containing internotes are saved using scrapbook, the notes are gone.
None of the other extensions I've tried works seamlessly with scrapbook.
FloatNotes/Xstickynotes - Notes are saved but are no longer editable
Scrapbook integration is a must if you're all for local backends. Essentially, scrapbook needs persistent highlights and sticky notes even before initiating a local capture. Persistent highlights can be achieved, although albeit inelegantly, using wired marker. Only sticky notes persistence/editability remains.
Hope this helps.