Netflix on Monday said it would abandon Microsoft's Silverlight media player plug-in for Windows and OS X in-browser video streaming, and replace it with a trio of HTML5 extensions. The move will be a blow to Silverlight, the technology Microsoft once aimed as a replacement for Adobe Flash, but that has languished since Silverlight 5 shipped in December 2011. Because Microsoft has never publicly committed to a Silverlight 6, many believe the platform has met its maker.