Firefox 4 does not appear newly installed plugins navigator.plugins array

In Firefox 4, I'm trying to detect with javascript whether a certain plugin is installed by looking in the navigator.plugins array. (https://developer.mozilla.org/en/DOM/window.navigator.plugins)

It seems that the newly installed in Firefox 4 plugins do not appear in this table.

I restarted Firefox, and they appear in the Firefox Add-ons Manager, but not in the navigator.plugins array.

I know Firebug works because I used it to show me the contents of window.plugins.

(In addition, you can even see that your script does not pick up Firebug when you got my list of plugins automatically to fill the field 'Installed Plugins' in this post.)

I think that the plugins installed via an XPI file as an extension should always appear on the topic: plugins page. I'm using Linux and this is how to install the plugin Silverlight (Moonlight).

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Tags: Firefox

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