(Shift+)Ctrl+Tab navigation for Firefox tabs: Tabs are presented in most-recently-used order, similar to Alt+Tab on various operating systems Releasing Tab and pressing it again moves to the next preview Pressing W closes the selected tab Releasing Ctrl switches to the selected tab Hidden preferences: browser.ctrlTab.mostRecentlyUsed, browser.ctrlTab.recentlyUsedLimit, browser.ctrlTab.smoothScroll