Firefox 29 copied Chrome. Had to use add-on to get back tabs on bottom.

Folks, This is a very short post.

Earlier I was able to do the following
browser.tabs.onTop false

Now it did not work. Luckily the following add-on made it work.
https://addons.mozilla.org/en-US/firefox/addon/tabs-on-bottom/

In case you are using user agent switcher like me, you will need
to call it firefox 29. Mine was earlier called firefox 26.

Shame on you Mozilla. In the name of allowing drag-and-drop customization,
you forced me install an add-on to keep what I customized.