Yahoo Toolbar Disabled

I have updated to the latest Mazilla. Ever since my yahoo toolbar is automatically disabled. It is easier for me to navigate my email accounts (yahoo, gmail…), youtube… when the toolbar is on. I have been trying like crazy to fix the issue but unsuccessful. Would anyone help?

Please look for help on our support site: https://support.mozilla.org/. It could be that the toolbar is outdated and you need to reinstall it.

Thank you for your reply. The problem when i try to reinstall it i receive a message saying toolbar already installed. Yet, it does not show