Mac OS downgrade - Bookmarks

I just downgraded my Mac OS from Big Sur (it’s crap) to Catalina via a Time Machine backup. Everything works great. However, I have LOST all my bookmarks.

Where were these kept? I have the full contents of my computer from last May 15th - way ahead of my blunder. I had bookmarks and now have none…

What file(s) do I need to move over?

Jerry