i think it would be a killer feature for Firefox, and a good choice for Mozilla, to store all Notes directly in .md / Markdown format, following the http://commonmark.org
GitHub is pushing Markdown to the masses (not only developers)
more and more text editors are going Markdown (see Ulysses, for example)
and anybody worried about data preservation agrees that the Markdown text format is the best compromise of readability and portability
if the Notes plugins would save in .md, we could open them in many other text editors
i know that currently Notes is based on CKeditor… but there are many Markdown JS/html editors around! see for example https://simplemde.com/
what do you think?