Container Tabs
There's a nice addon for Firefox, called Priv8: https://addons.mozilla.org/en-US/firefox/addon/priv8/This is a Firefox addon that uses part of the security model of Firefox OS to create sandboxed tabs. Each sandbox is a completely separated world: it doesn't share cookies, storage, and a lots of other stuff with the rest of Firefox, but just with other tabs from the same sandbox.