Add-ons are a web browser feature that enable users to make more
of their browsing experience, whether it is when playing games or
watching videos. The exact method of enabling add-ons varies
slightly according to each web browser. However, in Internet
Explorer, you can enable add-ons by selecting Tools and Manage
Add-ons. Click All Add-ons under Show, then click Enable for the
add-ons that you want to activate.