A simple note panel in HTML and JavaScript - includes a "copy to note" context menu item as well.

Use the Add Note icon - or click inside the lower text box - to add a new note. Notes are saved as you type.

Delete a note by selecting it in the list and clicking the Delete icon.

You can also copy text from a web page to a note using the context menu (but you will need to close the panel: am trying to fix this!)

Works with Opera (Blink engine); possibly other Chromium browsers; and Firefox.

Nab officially for Firefox.

Open source icons from PICOL.