Doesn't work well for me. For instance, I go on a page, add a sticky note, if I close the page and reopen it, the sticky note is there, but its content has not been saved. (and I'm logged in)
In the sidebar, if I click on a sticky note title, it doesn't show its content. Its shows weird numbers (for instance 416 374) instead. And I the note title is always automatically the page title, and is not customizable, and the addon is not optimized visually (poor icon in the addon bar (not easy to see), poor visual of the menus items, the note color customization menu is hard to find on the note, and allow only note by note color customization, and no other options) The sticky note list in the addon icon menu, shows nothing but a blank popup window.
Some other addons do the job better.