Beware: the suggestion from the comment above , i.e to reorder entries in containers.json does reorder, but with real bad side effect of wrecking your curated (site,container) assignments.Upon restarting FF, I noticed that all sites assigned to one ...
The suggestion in the comment above works for reordering, but with bad side-effects: upon restarting firefox , the restored tabs are all opened in wrong containers AND sites are assigned to those those containers -- effectively, your curated assignme...
