Is the restoring in reversed order with the Session Boss 2.2? Can you try it on the latest version 2.10? Thanks.

Edit: I believe the bug was caused by missing containers in the new browser. The session restore wasn't able to cope with undefined containers that its tabs were using. Please try out the new version 2.11. The new version fixes the bug and will ignore the missing container and restore the tabs in the default browser container.

Container migration across machines is a problem now because Firefox's container id is not portable across machines (across profiles). There's no API from Firefox to set the container id of a container; it's assigned sequentially by Firefox as a first come first set process. Containers need to be re-created manually and the tabs need to be assigned to the containers by hand in the new broswer. In future release, Session Boss will attempt to make container migration less painful with container restoration and batch tab assignment to containers.