> first party isolate is generally more stable and usually only has breakage on ...

jerheinze · on June 1, 2018

> 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 · on June 1, 2018

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