...Insiders will likely get to mess with extensions before the summer however, as the Insider Program will likely begin receiving new Redstone builds way before RTM is released to the public. Microsoft will want developers and insiders to test (and develop) extensions within Edge, so when the update launches consumers will already have a number of extensions available for the browser. For those who don’t know, Microsoft is working on a bridge to allow extensions developed for Chrome to be easily ported to Edge with little to no code changes, much like the Project Astoria bridge.We asked Microsoft for a comment, but provided us with a rather vanilla response:
Microsoft is still committed to delivering extensions for Edge, but with the feature now several months away, will consumers care by the time they arrive? Once they’re available, Windows 10 will be over a year old. Insiders will get to play with extensions much sooner than that of course, but Insiders are not an accurate representation of the people who use Windows 10 day-to-day, and at this point we don’t know when Microsoft is planning to begin delivering Redstone builds for testing. Perhaps in early 2016, or if we’re lucky, towards the end of this year.