If a website has plug-in content

Some websites use plug-ins to provide video, animation, or other special content. Common examples include Adobe Flash Player, QuickTime, and Oracle Java. However, plug-ins can be exploited and may present a security or privacy risk. You can choose to use only certain plug-ins on trusted websites you select.

A dialog may appear when you visit a website that has plug-in content or when you change the blocking policy for a plug-in in the Security pane of Safari preferences.

To change the plug-in blocking policy for future visits to a website, choose Safari > Preferences, click Security, then click Website Settings next to Allow Plug-ins. For more information about the policy options, see Security pane of Safari preferences.

See also
If a plug-in is missing
If features on a webpage don’t work