loatNotes is a Firefox extension, can add notes to websites, including comments, links or even images, enable you to keep notes for any websites. It can help you to do research on the web, remind you, etc. It is simple and easy-to-use.
FloatNotes Features:
1. Markdown support: You can use Markdown to format the text of the note. That means you can also include links and images.
2. Notes indicator: When scrolling on a web site, small labels at the top and
3. the bottom of the page show how many notes are above or below the current view.
4. You can also jump directly to a specific note via these indicators.
5. Minimizing notes: Notes can be minimized to save space.
6. Hide notes: All notes can be hidden with a single click.
7. Simple design: To fit into any page easily and to not gain to much "attention",
8. the design of the notes is kept very simple.
9. Locations: Specify the scope of a note.

Requirements:
* Firefox

The license of this software is Free, you can free download and free use this browser plug-ins software.