Looks like Microsoft is inching closer to releasing the Microsoft Edge browser with extensions to Insiders. In a web page captured and tweeted by @h0x0d aka WalkingCat you can see the early mockups of the extensions including two that look to be available immediately including one for Pinterest and RES or 'Reddit Enhancement Suite' that greatly improves the usage of the Reddit website.
Microsoft originally planned to have browser extensions for the November update, but they were pushed back until 'early 2016'. Windows Insiders will be the first to get the new feature to put it through its paces before going wide to the general public.
Full story from the WindowsCentral blog...