Also, I tried several times to "Bookmark Current Tab" and that feature does not work.  Nothing pops up to select where to file bookmark and when I go back to check, there are still no entries in the Bookmarks. 
 I checked, and I am signed in with my Gmail account.
 When I select a new tab, none of the icons for previously used websites are below the Google search bar.

Firefox updated last night and now my bookmarks feature is not working. All of my previous bookmarks are missing. I tried syncing several times to no avail. Also, I tried several times to "Bookmark Current Tab" and that feature does not work. Nothing pops up to select where to file bookmark and when I go back to check, there are still no entries in the Bookmarks. I checked, and I am signed in with my Gmail account. When I select a new tab, none of the icons for previously used websites are below the Google search bar.