Hi Alan, there isn't a way to add any new bars, sorry. Some users customize the Bookmarks Toolbar to "wrap" and continue on a second row. This is done using a custom style rule in an optional userChrome.css file. If you haven't heard about this before, it's about a 10 minute project to set up. Here's an example of the kind of style rules you would use: https://www.userchrome.org/what-is-userchrome-css.html#multirowbookmarks And this page describes how to set up a userChrome.css file: https://www.userchrome.org/how-create-userchrome-css.html

Note that you can also organize your bookmarks in folders. *https://support.mozilla.org/en-US/kb/bookmark-folders-organize-your-bookmarks