This add-on literally makes no sense at all. Firefox ALREADY behaves like this for ages. I was looking for an extension which does the opposite, disables this browser closing idiocy when you close the last tab. So I can sync the add-on via Firefox Sync so I don't have to manually switch browser.tabs.closeWindowWithLastTab to FALSE every time I reinstall browser...

If you can make the opposite of this, then you get instant 5 stars. But for this one, it's gonna remain one...