WhatsApp's web extension — through which you can send and receive messages directly from your browser — currently works on Chrome, Firefox, Opera and Safari (on the Mac), with official support not yet available for Microsoft Edge or Internet Explorer. That's set to change shortly, as a Microsoft program manager revealed that discussions were underway in bringing WhatsApp Web to the Edge:
There isn't a timeline available as to when we'll see the feature supported on the Edge browser, but those among us that extensively use WhatsApp will be glad to know that Microsoft is working on the issue. We'll let you know once we hear more.
Source: Twitter (David Storey)