hi, the following steps should get you back to the bookmarking structure you're familiar with :))

• click on the library icon and go to bookmarks > bookmarking tools > add bookmarks menu to the toolbar.
• now when you click the icon that's newly appearing on the toolbar, you'll get to the same bookmarks menu like in earlier versions...

This doesn't address my issue of the Bookmarks automatically sorting alphabetically every time I open Firefox.

Are you connected to the Sync?

Yes I do use Sync

Anymore suggestions