Almost.... Puntuado con 2 de 5 estrellas

I installed this because sometimes I accidentally close FF when I am working fast and have more than one window is useless to me because it only works if you have tabs open....I NEVER use tabs....I simply wanted a warning that I was about to close FF - even if there is no tabs open. (Yes, there are those of us who are not a slave to using tabs)

How it works

This addon has never had to act in case of a single tab. It is expected to show the save your tabs button for multiple open tabs.