How to remove or hide bookmarks toolbar in Mozilla Firefox?
To Hide Bookmarks Toolbar:
There are three options to remove bookmarks toolbar in Firefox,
Option 1: Click View → Toolbars and uncheck Bookmarks Toolbar.
Option 2: Right click below or above the address bar and uncheck Bookmarks Toolbar
Option 3:
Step 1: Click the Open Menu in Right Corner of Firefox window then click Customize
Step 2: Click Show / Hide Toolbars → Uncheck Bookmarks Toolbar
Step 3: Click Exit Customize.
Bookmarks toolbar will be disabled as given in the image below.