Difficulty: Moderately Easy
Step1
Open your Firefox browser in a new window.
Step2
Locate the browser's menu. Click on "View," "Toolbars" and "Customize."
Step3
Allow the pop-up to load. Some users may experience a slight lag in the browser's functionality and change in its appearance while the pop-up loads--don't exit out of the browser or window before the loading has completed.
Step4
Navigate to bottom of the pop-up window. Find the "Use Small Icons" option and check it.
Step5
Customize any other icon options you desire. Smaller icons in Firefox mean that you can fit more into the browser without having it seem cluttered. Place more icons onto your browser by dragging and dropping them onto the toolbar.
Step7
Exit out of the pop-up window and close your browser. Restart the browser for the changes to take effect.