Microsoft has launched Microsoft Edge Insider Addons site

Before Microsoft released Microsoft Edge, Microsoft is also preparing to build its own extension store for users to download and install. With the launch of the Chromium Microsoft Edge beta, Microsoft has also officially launched the extension store, temporarily providing only a small number of well-known extensions. Users can either download extensions through the extension store provided by Microsoft or directly to the Google Chrome WebStore store for installation.

You can visit Microsoft Edge Insider Addons here.