“Bookmark Sidebar” gives you the ability to add a toggle-able sidebar with all your bookmarks at the edge of your browser window. This extension is customizable (i.e. theme/color change, font size, etc…) and is one of the best browser extensions you will come across that syncs with your built-in extension bookmarks. It is totally FREE; however, there is an option to buy the premium version that will open the door to more options; plus, it helps out the developer.
Source: Bookmark Sidebar