In my browser version of Firefox, my bookmarks are organized in folders. For example, I have a folder called Work, containing work-related links.
I sometimes access my desktop bookmarks on the Android app of Firefox via the account sync.
The other day, however, I was looking to access a specific resource that I know was in my Work bookmark folder. So, I typed "Work" and, to my surprise, the folder did not appear as part of the suggestions.
Individual links appear (like, if I have a bookmark named "GitLab", i just have to type it in the search bar to have it suggested - but the folders don't appear.
Adding folders to the suggestions is just a minor thing, but that could end up being very practical - moreover since accessing the desktop bookmarks from the app is not that straightforward (we need to tap on the three dots, then "bookmarks", then "desktop bookmarks") - while accessing them from the search bar would allow to gain a few seconds.
TL;DR: Add the desktop bookmarks folders as suggestions when typing in the search bar of Firefox on smartphone.