You have fallen under the spell that so many programmers/designers have fallen under. Everyday needs change; better; more "see what I can do". In the process users end up going back FIVE steps to return to WHAT WORKED FINE!
Upgrading to v57 caused a loss of the "parent" column add-on (which wasn't all that great), loss of ALL bookmarks and pass codes, and loss of bookmarks on the home page display.
The Malthusian Trap is alive and well at Firefox.
Daniel LaPlante,
Totally Disillusioned User