1. Chrome already has this built in now: https://blog.google/products/chrome/new-chrome-features-to-save-battery-and-make-browsing-smoother/ https://blog.google

1. Chrome already has this built in now: https://blog.google/products/chrome/new-chrome-features-to-save-battery-and-make-browsing-smoother/ https://blog.google/products/chrome/new-chrome-features-to-s... 2. You can organize your tabs into windows or groups (also built in), and close them all together that way. If you want to close all your tabs everywhere, just quit Chrome altogether.