How to disable all new features forever

Dear Firefox Community, I don't want to follow football. I don't want to see world time. I don't want to download Firefox for mobile. I don't want to change my home screen background. I don't want any new widgets automatically enabled. Kindly tell me if there are any setting/options/flags (including in about:config ) to avoid any new popups about all those very useful features for as long as possible.