[ Thanks to Richard
for this link. ]
“It currently supports continuous synchronization of
your bookmarks, browsing history, saved passwords and tabs, as well
as form-field history and preferences. For example:“Get the same results on the Smart Location Bar on each of your
Firefox browsers, so you can get to your favorite sites with just a
few keystrokes“Continue what you were doing: have the ability to open any tab
you have open on any of your Firefox browsers”