Embed Silverlight Via Javascript
If you experiences that firefox 3.5 does not load your silverlight,While when you check online the silverlight add on/plugin is already there .
Then it's Time to embed using javascript. this works Like SWFObject.
Upgrade your Silverlight.js to the latest one, currently version 3.
than use the createObject method on document ready
More Detail
http://msdn.microsoft.com/en-us/library/cc838259%28v=VS.95%29.aspx
Property Param Detail
Other than this there are Silverlight.supportedAgent.js which have a method to call wheter this browser is supported or not