Compare to Microsoft's plugins for Chrome[1] and Firefox[2], which have to actually override the <video> tags with WMP embeds because Google and Mozilla don't provide any mechanism for the user to extend codec support.<p>[1] <a href="http://www.interoperabilitybridges.com/wmp-extension-for-chrome" rel="nofollow">http://www.interoperabilitybridges.com/wmp-extension-for-chr...</a>
[2] <a href="http://www.interoperabilitybridges.com/html5-extension-for-wmp-plugin" rel="nofollow">http://www.interoperabilitybridges.com/html5-extension-for-w...</a>