It seems there are a variety of extensions causing this issue, so we'd like your help in pinning down which exact extensions are causing this issue for you--there are a lot of extensions called Super Mario Bros and Super Mario World! In order to help us, please follow the following steps:
Some of you have also reported apps causing this issue. Please confirm if the app you are referring to is in fact an app and not an extension; do you see it on chrome://chrome/extensions/? If so, than it is an extension and not an app.
In addition, if you'd like to report abuse for the extensions causing this issue, you can do so by following this path: The url for the extension/app in the Chrome Web Store>Details>Report Abuse.
You can also leave comments and reviews about the extensions in the "Reviews" section of the extension's page.
Thanks for your help as we work to resolve this issue! Jessica