[ChrisSD]

> first party isolate is generally more stable and usually only has breakage on particular login forms

Are you referring to third-party login services and comment systems (such as disqus and similar)?

[jerheinze]

> 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_...

[mirimir]

Most of those involve third-party logins. And most of the others mix domains unnecessarily, through lazy design.