So this is the solution: # Locate your firefox profile folder, in this article they say where you can find it: http://kb.mozillazine.org/Profile_folder # Find your profile folder mine was: '''C:\Users\***\AppData\Roaming\Mozilla\Firefox\Profiles\***.default\''' # Locate a folder called '''chrome '''(if it doesn't exists create one through your O.S) must be lowercase # Locate inside chrome folder the file: '''userChrome.css''' (if it doesn't exists create one through your O.S, google how to create a .css file on notepad) Chrome must be cased as shown above # Add the code: https://pastebin.com/1r6cc8hW # Restart Firefox, now you are done, if you don't want text to be displayed within the icons just remove the last line. Hope this helps you guys out, this way if you have like 80 bookmarks icons you don't need to edit every single one of then, and you still able to identify bookmarks just on mouse hover in case you forget (happens to me all the time).