Firefox Tabs On Bottom/Below The Address Bar/Toolbars

If you like your tabs on the bottom - below the toolbars - instead of on top, here is the simple solution. This works with the new Firefox version 29.0.1. 

You may have had your tabs below the toolbars up until now, and then Mozilla updated Firefox to version 29.0.1

If you want your tabs back below the toolbars, download and install Classic Theme Restorer. Restart Firefox. Then open the Add-ons page, go to Extensions, then click on Options for Classic Theme Restorer. Change Tabs On Top to Tabs Not On Top. OK. Done.

I found that manually making the change in About:config did not work, but this add-on does.

There are a lot of other things you can do with this add-on. See this page for more about this add-on.

Fix Thunderbird Tabs Position

Thunderbird 11 changes the tab position from being below the menu bar to above it. If this is annoying to you and you would like the tabs back below the menu bar, download this add-on for Thunderbird and install it.To do so

• Go to this page, right-click on  the Download Now button and save the file to your computer.
• Open Thunderbird (if you haven't update to version 11 yet, do so by clicking on Help, About Thunderbird, Check for Updates...), Tools, Add Ons.
• Click on the button with the cog wheel on it beside the Search for all add-ons field
• Select Install Add-on From File
• Navigate to where you saved the file, select it and choose Open
• Now your tabs should be back below the Menu bar