This is correct:

Code_Breaker said

This option to hide the Navigation Toolbar appears to have been removed from the menu in Firefox 29.

You might be able to use custom style rules in a userChrome.css file. If you search around, perhaps a specific rule will pop up.

You could try this query: hide navigation toolbar "userchrome.css" site:support.mozilla.org {Apr 1, 2014 – Dec 31, 2015}

Add code to the userChrome.css file below the default @namespace line.

• http://kb.mozillazine.org/userChrome.css

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

#nav-bar { display: none important; }

The customization files userChrome.css (user interface) and userContent.css (websites) are located in the chrome folder in the Firefox profile folder.

• http://kb.mozillazine.org/Editing_configuration

Note that current release no longer show a replacement location/address bar if you press Ctrl+L like very old versions did (Bug 953124).