"choose" function does not include all bookmarked sites

You would have to expand all folders and scroll down through all of them. Consider that some people are going to have over 1000 folders they are not all going to show as the most recently used folders. You have two lists that basically appear in about the same area. # to the far right of the chosen folder is expand/contract, that list will scroll through all bookmarks, but you will have to expand folders to see subfolders # next to the chosen foldername and within the box is a drop down arrow that indicates the 3 major folders plus about 5 of the most recently selected folders, note a line below those and that it overlays most of the area you see in item #1 above. If you have the "[https://addons.mozilla.org/firefox/addon/add-bookmark-here-2/ Add Bookmark Here ²] " extension you can adjust the size vertically within the box to help ou scroll through your bookmark folders, see pictures on the add-on page for that extension.