The way we check for extensions is different than how Joomla shows them in the Plugin manager. We do this intentionally to detect strange issues, like you may be having.
Can you go to the "Install/Uninstall" menu item, and then to the plugins tab, and check the version and information for the plugins you mention above? If the version is blank, it may mean that the installation of the plugins didn't happen properly, and you may need to reinstall them manually. If so, you can find those required extensions in the /admin/packages directory of the com_jfbconnect installation package you downloaded. Just install them like normal.
You can also try to just reinstall the whole JFBConnect component package which will reinstall the required extensions. None of your settings will be erased, so that's an easy option that shouldn't cause any problems.
Hope this helps, and let us know what you find!
JFBConnect Extension Check
