Temporary Containers - Firefox Add-on that lets you open automatically managed disposable containers
Lightbeam for Firefox - Mozilla is the not-for-profit behind the lightning fast Firefox browser. We put people over profit to give everyone more power online.
island - a free and opensource alternative to parellel space
Tree Style Tab - Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.
Ghost Browser - Ghost Browser improves your productivity with built in tab management and multi-session browsing so you can log into multiple accounts from one window.
App Cloner - Clone your Android apps so you can use multiple logins.