If you want to add an Internet Explorer mode button on the Edge toolbar, here is how you can do that. You do not need third-party extensions since Edge includes an in-built option for this purpose.

Microsoft’s plan for Edge: Integrated IE compatibility, better privacy New features will make Edge more than just a reskinned Chrome.

According to recent leaked builds of Microsoft's upcoming Chromium-based Microsoft Edge, the browser may contain both a Chromium Blink and an Internet Explorer rendering engine. This could be used ...

Microsoft outlines plans to combine Internet Explorer and Microsoft Edge with IE Mode in a future version of Edge.