Microsoft Silverlight was a browser plug-in and development framework for interactive web applications and online media. It depended on browsers supporting its plug-in technology; as browsers moved away from plug-ins and web standards enabled plug-in-free media, its reach narrowed. Microsoft ended Silverlight support on October 12, 2021.
What was Microsoft Silverlight?
Silverlight was a free consumer browser plug-in paired with development technology for creating rich interactive applications and media experiences using .NET-related technologies. It was not a browser or an operating system. Microsoft marketed it as a way to deliver interactive web content across browsers and platforms. Microsoft’s historical Silverlight datasheet describes the product and its intended use.
Why was Silverlight retired?
The public evidence points to a broader technology shift, not one documented private corporate motive. Silverlight depended on proprietary browser plug-ins, while browser makers reduced support for plug-in interfaces and web standards made it possible to deliver media without them.
In July 2015, Microsoft described content providers moving away from plug-in delivery such as Silverlight and toward HTML5-based players. It recommended standards-based media approaches built around DASH, MSE, CENC, and EME, emphasizing interoperability across browsers, platforms, content, and devices. Microsoft’s 2015 transition guidance explains that direction.
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Mozilla separately cited plug-in performance, security, and stability concerns, as well as the availability of Web APIs that could replace plug-in functions. Those are Mozilla’s stated reasons for its browser change; they should not be presented as Microsoft’s internal rationale. The combined context is that Silverlight’s plug-in-dependent model lost browser reach as standards-based alternatives became practical.
When did Silverlight support end?
Microsoft announced on July 10, 2019 that Silverlight would reach end of support on October 12, 2021. Its notice said Silverlight was then supported only in Internet Explorer 10 and 11; support for Silverlight in IE 10 was scheduled to end January 31, 2020. Chrome, Firefox, and Mac browsers were already unsupported at the time of the notice. These are the browser-support conditions stated in Microsoft’s 2019 announcement, not a description of current browser availability. Read Microsoft’s Silverlight end-of-support notice.
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Why does Silverlight no longer work in Firefox?
Firefox stopped supporting NPAPI plug-ins, including Silverlight, with Firefox 52, released March 7, 2017. Mozilla explains that plug-ins could slow browsing, weaken security, and contribute to crashes, while Web APIs had become alternatives for their functions. Mozilla’s support article provides its explanation and timeline.
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How did plug-in-free media differ?
| Aspect | Silverlight-style plug-in delivery | Standards-based, plug-in-free delivery |
|---|---|---|
| Browser reach | Required browsers to support the plug-in interface; support was later withdrawn in major browsers. | Uses browser web standards, which Microsoft described as supporting interoperability across browsers and platforms. |
| Installation | Required users to install and maintain a separate plug-in. | Does not depend on installing a browser plug-in for media playback. |
| Media technology | Relied on proprietary plug-in-based delivery. | Microsoft’s 2015 guidance pointed to HTML5-based players and DASH/MSE/CENC/EME. |
| Device interoperability | Dependent on plug-in and browser availability on a user’s platform. | Microsoft presented standards-based delivery as a route to broader cross-device and cross-platform interoperability. |
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