@dalias @ricci I don't remember now why, but I had to install the extension, so anyway I live with it now. I do use the "automatically assign site X to container Y", avoids some errors, having a dozen or so containers. Anyway the logical followup would be not to have to do that and each tab/site in its own container by default, with only the possibility to "open it" to other sites/containers, but otherwise fully restricted by default.