I red both pages https://support.mozilla.org/nl/questions/1194851?fpa=1 What a non discussion from Firefox development. Tyler Downer says that tabs on bottom is not the standard setup for Firefox. This was denied by others. What a non discussion! Let users choose what they prefer. tabs on top or bottom. Why the programmers are so violently against tab on bottom? Let user determine what they want as their standard. As Musicalman7 said, all those hours people spent programming their add-ons. Gone. I believe the developers got blind spots. They must more contact with the users and not give Happy112 said: I totally understand why not everybody is pleased with (any) changes - it's all a matter of taste : what one likes, the other one hates. It may sound corny, but there's just no pleasing everyone. In this case it is, make both solutions possible. Tyler Downer said: we just want the browser to be great for those who customize, and the many more who don't. Who says that the many more don't customize? Do they know how to customize? If they knew maybe they would. Happy112 said: Give your input to https://qsurvey.mozilla.com/s3/FirefoxInput/ Worth a try ....... Why? the developers know about it here. They read it. Give input again is again waisted time. Reading this question move tabs from top to bottom https://support.mozilla.org/nl/questions/1194851?fpa=1, developers just do what they think is good. Not what users want. The new API has it's good things, but Porting add-ons to and from other browsers should be easier is nonsense.