This means that the URL in question utilizes unsupported browser plugins.
Plugins are not widely supported by mobile devices (and by default most desktop browsers restrict them), which makes the content unavailable on mobile devices.
This Hint would trigger for any URL that contains any of the following plugins:
Consider the example below, of a page that utilises a Flash (.swf) plugin - this page would trigger the Hint.
Mobile and desktop browsers are increasingly blocking content from unsupported plugins, so the only real long-term solution is to remove the content and/or replace it with more modern, supported plugins (e.g. HTML5 video players instead of Flash).
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