All new Mozilla Firefox versions come with tabs in titlebar to save space but there used to be an option "Tabs on Top" in toolbar context menu which allowed you to toggle between tabs on top and tabs on bottom. So you could have the tabs below the toolbar using that option.
Unfortunately Mozilla has completely removed that option in the latest Firefox 15.0 version. We told you about this move in our Nightly update article.

If you have upgraded to the new version of Firefox but want to have the tabs on bottom, following tutorial will help you.
You can get the tabs back on bottom with the help of a secret preference present in about:config page:
1. Open Firefox and type about:config in the addressbar and press Enter. It'll confirm, click on I'll be careful, I promise! button.
2. Now type ontop in the Filter box and look for following boolean key:
browser.tabs.onTop
3. The entry "browser.tabs.onTop" would be set to true. Double-click on it or right-click on it and select "Toggle". It'll set its value to false.

4. That's it. It'll immediately put tabs on bottom. Enjoy.
Posted by: Vishal Gupta | Categories: Mozilla Firefox, Troubleshooting
leomate
Maybe mozilla trying to hiding some menu elements.
draconem
I just updated to version 15 and still can turn TABs bar TOP or BOTTOM with the old right-click.
VG
^^ Not possible. Mozilla has removed it from Firefox 15.0. May be your Firefox is still using some old files? Try to do a fresh install of Firefox 15.0.
draconem
Did a clean install and it's correct, no more TABs on TOP option in the contextual menu.
So, just let's clarify:
a) Updating thru "Help > About Firefox > Search for updates" button or downloading the offline installer, keeps the settings.
b) Performing a "clean" or "new" install of Forefox, will have this issue.
I've been following your work for quite some time, and I guess it's time to thank you for all the good job.
VG
^^ You are welcome. :)
Prabhjot sohal
Aaa ghaint aa
its working good
ankit
draconem,
Please check the directory you have installed are the same as the executable you have currently in Firefox.
You can use Task manager to open the executable and figure out the location of that file.
You can also open the executable firefox.exe and check the property and go to detail section.They also include the version no their.
Thanks
toto
thanks man, i coudnt get used to tabs being top,not in a million years, cant see why they buried it in config..
Lisa
Thanks for this - was driving me crazy.
Shame firefox now seems unstable - ended up with this issue by resetting everything trying to get it to stop freezing and those annoying script errors that I never got but now happen regularly.
rcmero
I use the same executable for Firefox in both Windows XP and Windows 7. I can put the tabs back on bottom the old fashioned way on Windows XP but not in Windows 7. What is up with that?
VG
^^ It means the executable detects the OS and hides the option only for Windows Vista and 7.
mike
Thanks - I hate it when idiots decide how i like things and take my freedom to change away.....bad on you Mozilla.
HotRod
One word describes you.... GENIUS. Thanx
required
Thanks! I recently installed the latest version of Firefox on my grandma's computer, and I couldn't find the option for moving the tabs.
Ross
Thanks for publishing this. I don't know why mozilla would try to force people to have them on top :/
Jon
Many thanks. I HATE tabs top. Thanks sooo much. Worked slick and I will be following you for more tips.
Claudia
Thank you so much
My tabs are on bottom and I enjoy it.
Ghis
There has to be some j-rk in the Mozilla developers department. They must find that mole and get rid of him/her, and make that mole unable to work in any software dev anywhere again. If any, this mole keeps firefox dev's working in fear of google-chrome and wtf more.
Otherwise eyes-wide-shut, it is obvious. Because...
-->Mozilla has always worked as no-one (IE, Opera, Safari, etc) was in the race, therefore never wasting time looking behind and keeping them far ahead of the pack. (anyway.... stats that IE is leading are misleading as IE is force-fed to the populasses into their OS ....... DUH :) (it is as saying, or same as if, M$ would pride themselves in selling more anti-virus than Linux does .... duh again ;) (and even created more jobs because of this M$ "weakness to mal-ware" ... duh again for a completed hat-turn now)
Moz's has been doing lots of left/right useless turns in these past couple of yrs.
Firefox is still used because of its users and all the hacks they can do. Not because of the dev, and it is sade. Other browsers are built to display everything on a web page except the info everyone is looking for. This is a waste of work-time in any office that needs the net to work and research.
I update firefox only twice a year. I keep a close eye on my user's folders so any update won't corrupt them. Otherwise, I waste my spare time searching and working for firefox to work as it use to, instead of using my time for browsing.
This hack-search tonight was the result of not using such back-up on a new linux install. I usually browse with firefox with everything it had, cookies, fav, history, pass-words, addons, user-chrome, even the last tab open, it had on a deleted linux distro with any new distro I install (trying to stay away too from any ubufox or susifox or any linux preloaded or OS install option addon for firefox. In my book, Firefox addon has to be install with firefox, even when I have to wild-card the "install.rdf" ;)
But my "about:config" has too many useless hacks made into. It is hard now to reset any without knowing if it is still useful.
I'm really glad to find some other "about:config" that are useful, but sadely removed by mozilla.
Good thing I can always find everything I look for, and more, right here :)
As always, Great work AskVG :)
Peace
Ghis1964
Stan
Thank you a thousand times. This has been driving me crazy.