I thought I was the only one using Go to Parent Folder and Show Parent Folder mentioned in the other review - and these two legacy extensions if they can be forked into a webextension - that would awesome for FF57. I use it daily - search my thousands of bookmarks, right click the search and pick go-to-parent folder so I can see where I stored them in my bookmark folders. invaluable. Hoping you may take on this project of convert them from the original by Alice0775.