How do I detect a custom plugin in Firefox/IE/Chrome?

My team wants to build a "plugin" for firefox/chrome/IE. How do I use javascript to detect if this plugin (not extension) is installed? I would like to have a piece of **javascript** that can detect if a certain plugin is installed. Returns true if installed, returns false otherwise. For do I get a list of plugins, and then loop through to see if one of them match my plugin name? If match, return 1.

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