They handle it gracefully. As per their write-up[1]: > In addition, Total Cookie Protection makes a limited exception for cross-site cookies when they are need

They handle it gracefully. As per their write-up[1]: > In addition, Total Cookie Protection makes a limited exception for cross-site cookies when they are needed for non-tracking purposes, such as those used by popular third-party login providers. Only when Total Cookie Protection detects that you intend to use a provider, will it give that provider permission to use a cross-site cookie specifically for the site you’re currently visiting. Such momentary exceptions allow for strong privacy protection without affecting your browsing experience. [1] https://blog.mozilla.org/security/2021/02/23/total-cookie-protection/ https://blog.mozilla.org/security/2021/02/23/total-cookie-pr...