Revert to legacy SameSite behavior

Category

Computer Configuration > Administrative Templates > Firefox

Scope

Both

Registry Key

HKLM\Software\Policies\Mozilla\Firefox

Description

If this policy is enabled, Firefox will revert to the legacy behavior of SameSite. This means that cookies that don't explicitly specify a SameSite attribute are treated as if they were SameSite=None. If this policy is disabled or not configured, Firefox will enforce SameSite=lax.