cancel the tab close programmatically

[Diamanti]

I have a TabClose event.
How to cancel the tab close programmatically?
gBrowser.tabContainer.addEventListener("TabClose", function(){return false;}, false);

[lithopsian]

TabClose isn't cancellable and has no default action. It is simply a notification.

[lithopsian]

Just guessing, but you still want a way to stop tabs closing? You could try overwriting gBrowser.removeTab(). This is certainly a common way to close tabs, but I don't know if it is the only way. You'll have to try it and see. I'm not an expert on tabs, pesky things.

[Diamanti]

I did so ty