Nice Toolbar Add-on and Highly Useful Rated 5 out of 5 stars
The Diigo toolbar add-on really works nice for me. It has a lot of useful options. I generally don't display the toolbar in my browser to save on screen real estate. The drop down button is highly useful. It allows me to quickly create a bookmark with all the tags and descriptions I want and do a quick search for the bookmarks I saved.
There are a couple of feature I would like to see in future versions. One, add a plus/minus sign next to the search results in the sidebar to let me toggle the title/description of the URL. Two, let me create custom short-cut key to toggle the side-bar, toolbar and "Bookmark this page" box.