how to keep warn you when closing multiple tabs from getting unchecked or disabled firefox
This should be in the settings under tabs but it is not. Instead they have decided to put the setting in a dialogue box when you attempt to close all the tabs Sometimes I uncheck by accident and everything disappears. Is there a way to disable this checkbox?
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Did you look at your general settings as well.
Try changing "warnOnClose" preferences In the address bar, type about:config and press. The about:config "This might void your warranty!" warning page may appear. Click I accept the risk! to continue to the about:config page. Enter browser.tabs.warn in the Search box, it will bring up the preferences: browser.tabs.warnOnClose browser.tabs.warnOnCloseOtherTabs browser.tabs.warnOnOpen
https://support.mozilla.org/en-US/kb/about-config-editor-firefox