How to stop firefox quiting last tab (when only one tab is open) without warning?

I want to turn off ctrl + w when only one tab is open so that when only one tab is open, and if I press ctrl + w by mistake he shoud warn me before closing the browser

You can set the pref browser.tabs.closeWindowWithLastTab to false on the topic: page config to prevent the closure of the last tab to close this window and display a close button if only one tab is open.

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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