Microsoft Plugin Silverlight Instant

Microsoft Silverlight is a deprecated web application platform that was used to create rich internet applications (RIAs) and multimedia content for the web. It was developed by Microsoft as a competitor to Adobe Flash.

However, we shouldn't remember Silverlight as a failure. It pushed the web forward. It proved that streaming video could be viable for mass audiences. It forced Adobe to improve Flash, and it demonstrated to browser makers that developers wanted powerful tools to build rich applications. microsoft plugin silverlight

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The Evolution and Retirement of the Microsoft Silverlight Plugin Silverlight still runs in isolated environments:

Despite being obsolete, Silverlight still runs in isolated environments: microsoft plugin silverlight