Developers can now submit their extensions for Microsoft's new Chromium-based Edge browser, the company announced today. The new Edge is set for launch on January 15, so Microsoft wants to have a robust Edge Addons store, also saying that if you're a developer and you have a Chromium extension, it likely won't take any additional work to port it to Edge.
If you have created a new Edge Legacy extension, the last day to submit it will be tomorrow, December 17. It makes sense though, since beginning on January 15, Microsoft is going to start moving people to Edge Chromium. The migration of 900 million Windows 10 users is going to take some time, but it's clear that EdgeHTML is a thing of the past.
Those that already have Edge Legacy extensions on the existing store will want to submit Edge Chromium extensions as soon as possible. Microsoft noted in the blog post today that if there's no Chromium extension available, then the extension won't migrate when the customer is upgraded. And since Edge Chromium currently doesn't have any kind of extension syncing, your customer will have to manually obtain that extension again.
If you want to submit an extension for Edge Chromium, you can do so at the Partner Center Developer Dashboard.