Comment by strcat

GrapheneOS has a lot planned for Vanadium. It could become a project almost as large as the core OS project. We're going to be greatly expanding our team and that needs to happen before Vanadium can have substantially more changes than it currently does. Full state partitioning including for cookies is a much better approach than disabling third party cookies. Vanadium does disable third party cookies but that doesn't really do as much as you'd think because the way third party cookies are defined and what disabling them means is not intuitive. Third party cookies would not be a significant issue if cookies were fully partitioned by the top level site. Chromium has implemented state partitioning for the vast majority of the state but specifically not cookies by default where it's opt-in, so we need to handle that ourselves. They do support partitioned cookies but it's opt-in. Strictly partitioning cookies breaks a lot of cross-site functionality so no mainstream browser is doing it but rather they use heuristics to support cases like cross-site login and their partitioning is easy to bypass through that.