FnotePad.
Firefox addon for adding Pin tab to be used as NotePad in browser window. one click on FnotePad toolbar button and you got a editable window to be used as notepad with in your browser window.
Author: @AshishNamdev
Support : Having trouble with FnotePad ?
contact : ashish28.sirt@gmail.com
Downlaod : click here to download FnotePad