Unknown plugins

I clicked on the "Check to see if your plugins are up to date" in the Plugins section in Add-ons Manager. I see a bunch of Google plugins (Picasa, Google Update, Google Talk Plugin Video Renderer) and Windows Live Photo Gallery in a section titled "Unknown Plugins". I was wondering if this is a problem on the end of the makers of these plugins (not keeping them up to date or not making them in such a way that Firefox can recognize whether or not they are) or if it is something on my end?

Also, my "Google Earth Plugin" is outdated but clicking Update Now does nothing. Does anyone know the reason for this?

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