I do see one thing missing. On my current profile I see various icons next to my bookmarks. In the new profile I only see a generic globe next to each bookmark. I seem to recall that MANY years ago I had to do something to make these icons appear but honestly I have no idea how or what I did.
If you visit a bookmarked site the icon should appear.
I thought that would do the trick. However, it seems to be hit and miss. I have a group of bookmarks in a folder on the bookmark bar. I opened all in tabs and only 4 of 11 bookmarks picked up their icons. On my "production" profile 10 of the 11 have individual icons. Perhaps Firefox will learn them all over time. I vaguely remember there being some technique to kick the thing in the pants and make it populate the icons but I have no idea what it was. I observe that 10 of the 11 sites have icons on their tabs but these have not spread to the bookmarks.