Chrome: Many of us keep a lot of browser tabs open at once. It's even more common if you're researching something and you suddenly find yourself with 30 open tabs and no idea what to do with them. OneTab is an extension that unloads them all and palaces them into a list.
The purpose of OneTab is to really embrace the world of tabs. Instead of dumping your research into a service like Evernote, OneTab lets you go about your day opening as many tabs as you want, and with a click you can close them all and save them as a simple list. From there, you can save that list as a web page (that you can open later), or restore them all immediately.
OneTab can essentially be used to create temporary bookmarks of every tab you have open with a click. If you're the type to open a million tabs at once, OneTab is a way to keep those organised without actually keeping them open.