Web page stop asking me if I really want to leave

A few times I will try to close a tab, and I get a popup asking me if I really want to leave the page. How can I stop it?

You can double-click the pref dom.disable_beforeunload on the topic: config page to change its value to true.

You can open the topic: config page via the address bar.
You can accept the warning and click on "I'll be careful" to continue.

Tags: Firefox

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