Try:

• Multirow Bookmarks Toolbar Plus: https://addons.mozilla.org/firefox/addon/multirow-bookmarks-toolbarplus/

Not allowing me to install it....I get a box that prompts "Add to Firefox" When I click on that another box pops up that says it will be installed after Firefox is re-started. I re-started and nothing....Any ideas or suggestions????

Delete the files extensions.* (extensions.sqlite, extensions.ini, extensions.cache, extensions.rdf) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
New files will be created when required.

See "Corrupt extension files":

• http://kb.mozillazine.org/Unable_to_install_themes_or_extensions

If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to do a compatibility check or see if there is an update.