How do I find browser plugins that are installed but not active/enabled?

I have seen solutions to find out if a plugin like reader or flash in installed.

Is it possible to detect if a plugin is activated or not through开发者_JAVA百科 JavaScript?

However, those work only when the plugin is active. Is there a way to find out if a plug in installed but is not active/enabled at this time?

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I dont think so, because a deactivated plugin should have no impact to the application anymore. Thats what is meant by "deactivated"