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missing restore previous session from menu

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firefox failed to quit so I did it from activity monitor, after restarting it my session wasn't restored and I noticed the option to restore was also missing, I managed to recover the tabs, redownloaded and installed firefox v 65 but the option is still missing from both history and 3 lines menu any clue?

firefox failed to quit so I did it from activity monitor, after restarting it my session wasn't restored and I noticed the option to restore was also missing, I managed to recover the tabs, redownloaded and installed firefox v 65 but the option is still missing from both history and 3 lines menu any clue?

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http://osxdaily.com/2010/08/15/mac-task-manager/

Firefox needs to be properly closed for the previous session to be saved.