Customize Firefox controls, buttons and toolbars

Customize Firefox controls, buttons and toolbars {web link}

Type about:customizing<enter> in the address bar.

Note: about:customizing is no longer present in Firefox 47+ releases.

• Press Alt or F10 to bring up the Menu Bar.Then View > Toolbars > Customize.
• Right-click on a blank spot in the toolbar and select Customize.

In the new window, look for the icon. When you find it, hold down the left button on it, and move it to where you want it to be. You can move any of the icons you want from here, but; some icons are locked in place.

There is also a Restore Defaults button at the bottom middle.

Note that some toolbar buttons aren't shown anymore by default useless they have been used. This includes the Home and the Library (bookshelf) and Sidebar buttons and in such a case you need to drag them yourself from the customize palette to the Navigation Toolbar.

You can look on the about:config page at browser.engagement prefs to see what buttons this is about.