Here I attached a picture to help you! :D

Yea, that doesn't separate them. In fact, you can't even move it.

Notice how the url bar / back button is a bit greyed out.

This add-on will allow you to do this :D https://addons.mozilla.org/en-US/firefox/addon/noun-buttons/?src=search

Why do I need an addon to do this?

I already have 3 installed just to get the tabs under the address bar, get the classic theme back and get the classic buttons back.

You can look at the Classic Theme Restorer extension to restore some functionality that was lost with the arrival of the Australis style in Firefox 29.

• Classic Theme Restorer: https://addons.mozilla.org/firefox/addon/classicthemerestorer/

• You can check out the settings of the CTR extension via its Options/Preferences button on the "Firefox/Tools > Add-ons > Extensions" page.
• You can find extra toolbar buttons and more toolbar settings in Customize (3-bar Firefox menu button > Customize)

This includes a setting to have customizable Back and Forward buttons.

See also:

• https://support.mozilla.org/kb/how-to-make-new-firefox-look-like-old-firefox
• https://support.mozilla.org/kb/common-questions-after-updating-to-new-firefox
• https://support.mozilla.org/kb/learn-more-about-the-design-of-new-firefox