Microsoft today released another Windows 10 build to the Fast ring for PC and Mobile, bringing the build number to 14936. With it, the company announced a new Edge extension, Turn Off the Lights.
Turn Off the Lights is "a lightweight and useful add-in designed for a more comfortable video experience." It's not available for the general public, and you'll need to be on the Fast ring to test it out.
The company also said that it still needs help testing out the new extensions that were announced alongside build 14926. One of those is Tampermonkey, which is a userscript manager that allows you to customize the pages that you see on the web.
There's also Microsoft Personal Shopping Assistant, which promises to be a "smart shopping cart across the web". It sees the products that you browse and gives you alerts for deals when they're available.
All of the mentioned extensions are available for Insiders only; you'll need to be on the Fast ring to get them.