Being able to change bookmark folder icons can be really helpful when you have too many folders in your bookmark. Bookmarks Folder Images is a Firefox add-on that brings the ability to Firefox so that you can change icons for bookmark folders in just a few clicks.
The add-on has a large supply of icons from simply colorized icons to icons that come in different shapes. If they aren’t attractive enough, you can add your own icons. It also comes with a help file should you need help in understanding how it works and how to add custom icons.
After you change the icons, you will be able to see the result instantly in bookmark toolbar, bookmark sidebar, bookmark menu and library view.
The add-on button can be found in the Firefox menu panel.
Download and install Bookmarks Folder Images to change bookmark folder icons in Firefox