Can I determine if a user has a browser add-on enabled?

Question

I am using a PDF viewer in an MVC application, object id='pdfbox'. For this to work an add-on has to be enabled in the browser: Adobe PDF Link Helper.

Is it programmatically possible to determine if the add-on is enabled or not in the client machine and give to link to enable the add-on?

Is any sample code available?

Answer 1

You could try providing alternate content which will be displayed if the plugin is not installed:

<object ...>
    <p>
        You do not have the XXX plugin installed. You could download it here
    </p>
</object>