Try use the [https://addons.mozilla.org/en-us/firefox/addon/classicthemerestorer Classic Theme Restorer], from version 29 isn't put the address bar above the tabs bar, but with Classic Theme Restorer add-on you can!

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

#TabsToolbar{ -moz-box-ordinal-group: 10000 !important; margin-top: -1px !important; }

You can move the tabs to the lower position just above the browsing area without using an extension with code in userChrome.css because you only need to give the Tab bar a higher -moz-box-ordinal-group value (most toolbars have a default -moz-box-ordinal-group:1 to show them in DOM order). Add code to the <b>userChrome.css</b> file below the default @namespace line. *http://kb.mozillazine.org/userChrome.css ---- <pre><nowiki>@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */ #TabsToolbar{ -moz-box-ordinal-group: 10000 !important; margin-top: -1px !important; } </nowiki></pre> ---- The customization files userChrome.css (user interface) and userContent.css (websites) are located in the <b>chrome</b> folder in the Firefox profile folder. *http://kb.mozillazine.org/Editing_configuration You can use this button to go to the currently used Firefox profile folder: *Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder) *http://kb.mozillazine.org/Profile_folder_-_Firefox

Sorry, userChrome.css doesn't seem to work in version 35.0.1