Also the management portal hasn't required Silverlight for at least a year now, it's all HTML5.
And if you don't want to use the portal then there's command line tools for both Node and Powershell.
Seems to have been a more general change; the Bing Webmaster Tools portal dropped Silverlight about a year ago as well. Not sure if there was an official announcement or they've just quietly decided to move away from it.