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Re:Facebook Container for Firefox by Aissen on Wednesday April 18, 2018 @03:44AM (#16865501)
It doesn't work all the time. I tried it with Google login on Atlassian, it seems to rely on third-party cookies, and fails. There are a few bugs open on websites that don't work with this feature:

https://wiki.mozilla.org/Security/FirstPartyIsolation#First_...

Re:Facebook Container for Firefox by SparkyMcUnicorn on Wednesday April 18, 2018 @12:38PM (#16868769)
I assumed it didn't work because it was an Atlassian site I was logging in with. Thanks for pointing this out.

Container tabs works for me very well, so I don't see much point in switching over and dealing with little bugs like this.

Re:Facebook Container for Firefox by sourcesmith on Wednesday April 18, 2018 @06:48AM (#16866210)
Atlassian actually rely on referrer headers as well! Extensions such as smart referrer break their single SSO system.