Added
keep_last_tabis now a tri-state mode (#3):0— close the window when the last tab is closed (default Chrome behavior)1— keep the window open by opening a new tab (previous on-state)2— close the window only when the last remaining tab is an idle new-tab page
- New-tab detection for mode
2uses the tab title plus an omnibox-focus guard, so it closes only on an idle NTP and never discards in-progress address-bar input.