Comment 0 for bug 1388917

When you have a huge bunch of bookmarks in Firefox custom toolbar, you will want to put them in folders. When folders are displayed in the vertical extension (when screen width is too small), then the folder's icon disappear, only text remains. For test purpose, if you have not enough bookmarks to go over the screen limit, no need to create dummy ones: just move an existing one to the very right, then resize the windows and see how the bookmark folder icon looks like.