Firefox only (Windows/Mac/Linux): Firefox extension Panic provides a simple keyboard shortcut to instantly close all of your current tabs while opening a new, more appropriate one. So let’s say you’re at a workplace that supports reading Lifehacker (you are boosting your productivity, after all). You could set Lifehacker as your panic URL, then start looking for your boss’s birthday present on Amazon. (You are so nice!) When your boss turns the corner, just hit the customisable keyboard shortcut to close your active windows and fire up your panic URL. Of course, Panic’s boss key would work just as well for less noble purposes, and it works fast. Panic is free, works wherever Firefox does. For other Panic alternatives, check out previously mentioned apps like the Magic Boss Key, Windows Hidie, and workFriendly.