Yeah i just want that single button back, the one that the old firefox used for closing tabs, i don't like the individual ones.
In every discussion forum I've seen about the new Firefox, people have mentioned this. It wound me up as well - why did they feel the need to change it?
Anyway, allow me to rid you of this curse.
Type about:config into the address bar
Scroll down to browser.tabs.closeButtons
Right-click on it and select Modify
Type in 3 into the box
Begone cursed little tab closing icons