This happens when you are trying to load Adobe Shockwave content. That message indicates you already have the plug-in installed for your browser or computer. If you trust the content you're about to load, then accept the changes and allow it to run. Shockwave was mostly used in 90 % of the cases for games which should be fine. However, check if the website is secure first. Click the icon next to the HTTP://website to see the SSL information. Never load content on an unsecured website.
