Very good. 2 suggestions: (1) Add a toolbar icon that opens a sidebar or popup with a list of the bookmarks in that folder. Similar to how Pocket used to be. Also seen in the outdated "Save-To-Read" add-on. (2) After creating a new bookmarks folder for this and setting it as the default for the icon, it also sets it as the default for all bookmarks, so whenever I bookmark something using the usual Ctrl+D it wants to put it in my "default bookmark folder" folder. Prior to this add-on, it would save new bookmarks in the most recently used bookmarks folder (so for example if I'm visiting 6 or 7 related sites and I want to bookmark all of them and put them all in the same folder, after I navigate to the correct folder when bookmarking the first one, all the others will have that folder selected by default). For some reason this add-on prevents that and sends everything to this default folder, making things a bit inconvenient at times.