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Sidebery - Manage your tabs and bookmarks in sidebar.
App Cloner - Clone your Android apps so you can use multiple logins.
Tree Style Tab - Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.
Dual Space - It is a first application that is compatible with WhatsApp completely.
Firefox Multi-account Containers - Sign in to two different accounts on the same site
island - a free and opensource alternative to parellel space