WE HATE TABS ON TOP CAN YOU PLEASE STOP BEING PRICKS AND FORCING THIS ON USERS?
Stop, I am about to drop firefox. Since 50 something you changed, and you say its always like that but that is false. You changed tabs on top like in version 40, since then we all complain and you insist on this. I am about to drop firefox for good. Stop
Tabs have been on top by default since (I believe) Firefox 29. However, there are ways you can move them back down. The folks at https://www.reddit.com/r/FirefoxCSS/ can help you modify Firefox's UI to your preference
They don't care. Heres a handy chart of the history of this debacle.