|I don't know whether the browser you were previously using makes|
backups of your favorites. Foxfire does. You might find backups
saved somewhere. Or you may have exported your bookmarks at
sometime in the past, and forgot that you did so. They could be
in a .htm or .html file. Possibly bookmarks.html or favorites.htm.
(Foxfire's backups have a .json filename extension, but they are
just text files. The .htm files are just text files, too.)
Chances are, though, your old favorites got wiped out when you
installed the new browser.
-- Jeff, in Minneapolis