I was really dreading moving the 200+ tabs I have open in 3 different windows from my old laptop (Miss Sakamoto) to the new one (Caroline4Five2). Mozilla Sync would allow me to get a list of them all, and open them... *one at a time*.
Solution: use Bookmarks > Bookmark All Tabs and create 3 temporary "folders" in my bookmarks, for each window. Sync from Miss S.
Then sync on Caroline, open a new window, and "Open All in Tabs". Presto!