Although Microsoft has previously confirmed that it will be replacing the "often unreliable and insecure native add-ons" with an all-new extension platform for Microsoft Edge, According to the preview page, the company is preparing to announce extensions support for its Microsoft Edge starting with a selection of extensions such as Microsoft Translator, Mouse Gestures, and Reddit Enhancement Suite for those running Windows 10 Insider Preview builds.
According to Microsoft "Personalize and add new features to Microsoft Edge with extensions. Starting with build XXX for the Windows 10 Insider Preview, a selection of extensions is now available for Microsoft Edge" The company continued "When fully released to mainstream builds of Windows 10, extensions will be available via the Windows Store".
Microsoft Edge Extensions Support is expected to be announced very soon. Unfortunately, the preview page of Microsoft Edge Extensions has since been removed. Although, a cached version can be viewed through the link down below.
Microsoft