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Firefox Multi-account Containers - Sign in to two different accounts on the same site
App Cloner - Clone your Android apps so you can use multiple logins.
Temporary Containers - Firefox Add-on that lets you open automatically managed disposable containers
island - a free and opensource alternative to parellel space
Dual Space - It is a first application that is compatible with WhatsApp completely.
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.