A recent Firefox Android update made it so that bookmarks and bookmark folders are now automatically sorted by date created (or used, perhaps?), most recent first. From what I can gather from this bugzilla report (https://bugzilla.mozilla.org/show_bug.cgi?id=1928574), this was a deliberate design change.
This change is extremely detrimental to the way I use bookmarks. I have hundreds of them, all neatly organized into folders and subfolders and ordered precisely how I want them. I absolutely do not want Firefox to arbitrarily override this ordering.
Previously, when syncing bookmarks from the Desktop browser, Firefox Android preserved the ordering of bookmarks. It was possible to sort bookmarks as you liked in the Desktop browser, and this would carry over to mobile. The only way to restore this behavior at the moment is to access the Secret Settings menu and toggle off the Enable Compose Bookmarks flag.
Please add an easily accessible (not buried in developer settings) option to disable this automatic sorting and restore the previous behavior.
Instructions for disabling automatic sorting currently: