Echo JS 0.11.0

If you are dealing with a security focused implementation, there's also sessionStorage which has pretty much the same interface, but limited to a single tab/window.  I use this for development in syncing/storing redux state, so that it can refresh the screen and keep the same redux state.

It also helps if you need to be able to impersonate other users in another tab, etc.  You can pass an initial key/token when opening a new windows.