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I can't re-enable the save and quit option when i close a window

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When you close a window, there appears a window containing the options: Save and close, close without saving and cancel, and a box that says do not ask again. Well, a friend checked this last option by accident and now every time I close when I open again I see the same pages where I was before closing. My question is: Is there any way to re-enable the option to exit without saving?

When you close a window, there appears a window containing the options: Save and close, close without saving and cancel, and a box that says do not ask again. Well, a friend checked this last option by accident and now every time I close when I open again I see the same pages where I was before closing. My question is: Is there any way to re-enable the option to exit without saving?

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In the Location bar, type about:config and press Enter . The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise! , to continue to the about:config page. Search for the preference browser.tabs.warnOnClose, and double-click on it which should set the value to true