I understand that in earlier Firefox versions (I have seen this feature in Firefox 3 and 4, I don't know when it was removed, or hidden) there was an option in the dialog which asks you if you are sure you want to close the browser which would allow you to
Quit & Save.
This option would do almost the same thing as force quitting the browser currently does when it crashes or is unresponsive. Is there such an option in Firefox 50? I am running Ubuntu GNOME 16.10 with GNOME 3.22.
I would like there to be an easy way of me accessing this option, however I won't want to use it too often due to security reasons so I don't want it to become the default.