Every time I typed a word in the notes interface, it immediately disappeared. Total waste of time.

Not working on FF 73.0.1 (Win10). Opening up sidebar again gives an empty box ... notes typed in are apparently not saved/retrieved. Will change rating if it works again.

Nice and simple. Would be great if there were an option to decide to save domain-related or page-related.

The main functionality is simple and great. The problem is I can't find my notes without remembering what websites I had notes on.

Great. Very simple, but perfectly useful.