But . . . for those with some bookmarks already there, it's best to go into Bookmarks. Show All Bookmarks and edit the existing. I've experienced a hotchpotch of the two when bringing in the new.
Also, the wonderful Bookmarks Toolbar seems to need to be fed one by one from the restored Bookmarks list. I've never been able to load it as an entity in its own right.
Unless anyone knows different.
