3 February 2021 I use a toolbar. Sorry, I'm old fashioned. When I install a new linux system, the first thing I do is change firefox to show the toolbar. There is a 'Bookmarks' item on the toolbar. When you click it, it gives you a menu of several options, including 'Bookmark This Page Ctrl+D'. Until recently, clicking on that option opened a popup that allowed you to select a sub-folder to put the bookmark in. That was extremely useful because a flat list gets very long very quickly. You could of course just click on save bookmark in the popup and it gets added to the flat list, or, as I do, you could first select a sub-folder. Now, clicking 'Bookmark This Page Ctrl+D' results in the bookmark immediately being saved to the flat list and a little alert momentarily pops up declaring 'saved to library'. Apparently 'library' is the same as 'other bookmarks'. How very clear (sarcasm). In addition to not knowing where the bookmark actually is, I now have to manually move it to the desired sub-folder with several other clicks. How convenient (sarcasm). I want the old behavior back. How do I get it? By the way, I am very old fashioned. I don't register with websites, even firefox. I used an email blackhole to sign up. I will come back here periodically (once a day) to see if there are any useful answers or questions asking for clarification. I've bookmarked this page, so it should be easy. When I'm done, I'll disappear forever, thank you very much.