Splendid Browser Manager

The fastest way to launch multiple browser

12 Alternatives To Splendid Browser Manager

AirProxy

Dedicated mobile 4G/LTE proxies

AllAccounts

AllAccounts is an extension that allows Firefox to connect to websites using different user names.
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GoLogin

Easily switch between browser profiles to manage user accounts on websites.

Kameleo

Avoid browser fingerprinting and use virtual profiles.
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LimeProxies

Premium Private Proxy Service Provider

Logaway

Password protected sites have always been a problem for people.

Multifox

Multifox is an extension that allows Firefox to connect to websites using different user names.

Multiloginapp

Connect to websites as a multitude of different users

ProxyRack

More than 1,200,000+ unique monthly HTTP & SOCKS private proxies available.

Session Box

Using websites with multiple accounts at the same time is made easy.

Tree Style Tab

Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.
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island

a free and opensource alternative to parellel space