The order shown in your screenshot is the default order and as far as I know the order of the three buckets cannot be changed.

However, if you drag and drop one of the main buckets onto another one, that could create a copy of that bucket in the one you dropped it on.

What about the "Mozilla Firefox folder" in the Other Bookmarks?

Thanks.

If that's the folder which comes with a new installation of Firefox, it's normally on the Bookmarks Menu (see attached from a new profile).

However, you can put it wherever you find it to be useful, Firefox doesn't care. ;-)

So the Mozilla Firefox folder should be under the Bookmarks Menu?

Thanks.