An Edge Insider Addons store has been found that contains 84 extensions that will be available for Microsoft’s Edge Insider browser. The store is located at https://www.mnt.com/en-us/Microsoft-edge/insider-addons/category/EdgeExtensions. These extensions include AdBlock, DashLane, LastPass, Grammarly, Tampermonkey, and more. Microsoft is going down the same path and are calling them both addons and extensions. Users can click on each extension to read its details and install them.
Source: https://www.bleepingcomputer.com/news/security/microsoft-edge-insider-addons-store-discovered-84-extensions/