Very useful. None of the markup addons seems to do everything... This DOES have shortcuts to toggle highlight/clear/select; and one note drop-down per window which can paste formatted text, images and links. Works well and restored highlights on pages I tested. Doesnt work on moz pages or PDFs (no addons do)
BASIC NEEDS (for 5 rating):
1. Support page (gitx) to post bugs, feature requests instead of 531 users emailing the same thing to nowhere
2. Shortcut to edit the note
3. shortcut to save the note (or autosave - if you don't click save before return to browser, unsaved edits are lost)
4. button to open note in a full page with scrollbar - or at least a scrollbar on the dropdown!