When closing any single tab exits firefox entirely why? just started happing

Just rebooted system (Windows PC) on return from holiday.
When closing ant tab instead of that single tab being closed, Firefox closes completely even though I have not touched the main "X" how can I reset or resolve this issue?
Rich.

Courtesy '''jscher2000''' -
< (1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.
(2) In the search box above the list, type or paste "tabs" and pause while the list is filtered
(3) Double-click the browser.tabs.closeWindowWithLastTab preference to switch its value from true to false.
Press Ctrl+n to open a new tab, then Ctrl+w to close the tab. Helpful? >

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'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

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(Edited to make easier to read)
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I have selected:
 
'Use custom settings for history' with only the following options checked:
 
Remember my browsing history: (Checked)
 
Remember download history: (Checked)
 
Accept cookies from sites: (Checked)
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Cookies (CORRECTION: I don't have cookies selected because I always manually delete all cookies whenever I close the browser)
 
Active logins
 
Cache
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When closing any single tab exits firefox entirely why? just started happing

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