When I backup my bookmarks to a JSON file, I always do so to the same folder on my PC but the Save dialog defaults to saving on the desktop instead of to the folder previously used. This is profoundly unintelligent behaviour & extremely irritating, as it means I have to navigate through the folder tree every time I want to make a backup. There seems to be no option to specify a backup location, either in the Options dialog or in about:config. How can I tell Firefox either to remember the folder previously used or to default to a specified folder, rather than to the desktop?