browser.showQuitWarning not persistent

I want to remove the 'save and exit' option. Understand that it is controlled by browser.showQuitWarning. It affecting false would remove the possibility for 1 time. The next time it is reset to true and "save and exit" appears again.

Thanks for the reply.
discovered that I use a linux distro that has set a record to address
/usr/lib/Firefox/browser/defaults/preferences/vendor-Firefox.js
modify the corrected the problem.

Tags: Firefox

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