It's nice-ish, but unfortunately it doesn't help me with my problem. Though I can now detect where exactly my bookmark is, I an still not edit it's location easily.

There's a drag and drop option, but that won't help if you're in the middle of 50 bookmarks. Draggin it all the way up takes ages. It's faster to open the link and then edit the directory directly by accessing the star icon for bookmarks. If this add-on had a line that offered me what other folder to move my bookmark to, it'd provide exactly what I reqire.