Apps with 'Session separation' feature

Firefox Multi-account Containers
The Firefox Multi-Account Containers extension lets you carve out a separate box for each of your online lives – no more opening a different browser just to check your work email!
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Free • Open Source
Online
Firefox
Firefox Extensions
Session separation
Multiple Profiles
Multiple Account support
Multi Account Switching
Customizable
Multifox
Multifox is an extension that allows Firefox to connect to websites using different user names. Simultaneously!
Discontinued

Last version, 3.2.3, was released on 18 February 2017.
Last version is compatible with up to Firefox 52.
You can still download it from here: https://github.com/hultmann/multifox/releases/tag/3.2.3
More info on the discontinuation:
https://github.com/hultmann/multifox/issues/215
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Free
Mac
Windows
Linux
Firefox
Session separation
Update notifier
Multi-Session
Multiple Profiles
Firefox Extensions