Disable Markdown in preferences [feature-request]

If possible please add option to disable Markdown formatting completely in preferences.
It would be easier to make pure-text only notes.

e.g. I often uses pure txt lists of pros and cons like this:
- very easy to use
- resource free
- works one every webpage
- every plus (+) and minus (-) signs must be preceded with backslash () or will be converted to html lists
- every line must be ended with double spaces or it will be merged with previous line
- many non-common formatting glitches causing slowdown when taking notes

with Markdown formatting on there is much more formatting corrections (double clicks, backslashes, adding enters and double spaces, etc.)

Start by locating the preferences handling and Markdown formatting entry points in the Firefox extension. Trace how notes are rendered and how preference changes are applied. Done means users can disable Markdown formatting in preferences and create pure-text notes without Markdown list conversion or related formatting corrections.

Scritto dal modello di indicizzazione a partire dal testo della issue.