This is the Jesus of all add-ons Bewertet mit 5 von 5 Sternen

To this date, I've used it for a year and a half and I can't tell you how damn useful it is. This button kills dozens of tabs in a split-second, so I can open as many more as I want afresh and kill them all again instantly. This is a killer when you do an extensive research and despise mediocrity.