As far as I understand, you need to try and create an instance of ActiveXObject, and then check it successfully, and you can request the version through the built-in plugin ... nothing particularly exciting.
But in Firefox (and I think other NPAPI browsers), you can check the installed plugins and get the name of the DLL, etc. (at least on Windows). What exactly can I learn about installed plugins, in addition, if it exists? Plugin file name, anything else?
edit: And does IE support any way to request plugins without instantiating in newer versions?
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