there are so many times where i delete a bookmark by mistake and can't get it back...
just now... i deleted a folder that has so many important bookmarks by mistake and there is no way to get it back or even remember what i have deleted!
so please at least add it as an option when enabled, the bookmarks go to trash-bin or archive instead of disappearing forever.
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The bookmarks delete mechanism is generally hooked up to the undo/redo mechanisms so in most cases you should be able to undo your changes from the edit menu.
Worst case, there's a backup mechanism where Firefox is saving 15 backups of your bookmarks. More details about that here: https://support.mozilla.org/kb/restore-bookmarks-from-backup-or-move-them