I LOVE TABS ON BOTTOM!!!!!!! I purposely uninstalled Firefox 59 to go back to Firefox 52 so I could have Tabs On Bottom back. I tried to make an entry in the profile page for Tabs On Bottom and other things, but it wouldn't work for some reason. So, I rolled back Firefox. I absolutely can't stand the tabs on top and refuse to use it that way. If I can't fix it, ever, I will quit using Firefox altogether. I would probably go to Microsoft Edge.