I'm not quite certain why, but official computer and online tools for Dungeons & Dragons have always been a sad story. Usually you get a lot of promises for those tools when a new edition of D&D comes out, and then the whole plan falls apart and you get very little. That is what happened with the current 5th edition. For 4th edition, although the tools never lived up to the promises, at least WotC had two programs that worked quite well, a character creator, and a monster builder / database. And because my group like tactical combat and half of my players don't speak English and 5E isn't on offer in any other language, I am still using those online tools and pay a subscription for them.
But of course WotC isn't providing any new additions or support to the legacy website of D&D Insider. We can be happy enough they didn't shut it down yet. And as the tools work with Microsoft Silverlight, I now need to use Internet Explorer instead of Chrome. And I wonder how many other legacy sites there are out there that got created with plugins, and there is nobody to redo them in the new standard that Google is trying to impose on us. I would imagine that people are much more faithful to their preferred websites than to their preferred browser. If Chrome doesn't support your favorite websites any more, then goodbye Chrome! Google might well be shooting themselves in the foot with this more than hurting Microsoft.