Adds a Properties item to the browser's History sidebar context menu. Choosing this item will show a pop-up window with the URL and page title.
May 2011 update: I'm really sorry, but it seems that the add-on does not work with the latest Firefox, that is, 4.0 and later. After some investigation, it became clear that some internals of the History sidebar have changed, and there's too little motivation for me to fix the add-on. I do not use the History sidebar anymore, so... I'm sorry, but most likely I won't fix the add-on in the nearest time.
Thanks for understanding.