Rated 4 out of 5 stars
I think this one is quite good for organising bookmarks. However I can't do the shortcut with Ctrl + M like the developer said in some previous review.This review is for a previous version of the add-on (2.1).
Turning on the Sidebar
You can turn on the sidebar by clicking Control + Caps Lock. You can customize lots of things with the sidebar in the Customization Window under "Sidesam."