Thank you. It is very helpful but how do I export my notes?

Simple Notes is the only sidebar note-taking extension at the moment that can serve as a replacement for Quick Note, killed off by FF57. Thank you very much.

It seems to work all right. My only criticism is about the upper input box that retains the title of the individual notes. It wastes space, especially that it comes with a pre-determined minimum height. Apart from the 'add' and 'remove' buttons, the area over it also remains unused. I would welcome a change of interface with tabs on top.