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Re:Mozilla Project Fusion: Tor Integration into Firefox by jerheinze on Friday June 01, 2018 @05:03PM (#17210271)
> Are you referring to third-party login services and comment systems (such as disqus and similar)?

See the full list of bugs of breakage when privacy.firstparty.isolate is enabled: https://wiki.mozilla.org/Security/FirstPartyIsolation#First_...

Re:Mozilla Project Fusion: Tor Integration into Firefox by mirimir on Friday June 01, 2018 @07:50PM (#17211568)
Most of those involve third-party logins. And most of the others mix domains unnecessarily, through lazy design.