Microsoft have released their first preview version of their Edge browser with extension support, and plans to release soon. Extension support is currently available to download through their insiders program.
Microsoft plans to allow browser extensions to be installed by the Windows Store, which will allow Microsoft to control the quality and experience of extensions.
“To ensure the highest quality experience for customers, and as we have done with Windows 10 since the beginning, we will introduce extensions first to our Windows Insiders and then roll them out more broadly to all Windows 10 users.
Initially our Insiders will download and then sideload extensions for testing purposes, but ultimately we will make extensions available to all of our customers via the Windows Store to ensure the quality of the end-to-end experience.”