Microsoft relies on WebRTC in Skype for desktop. Microsoft did not specify what underlying technology is preventing Skype for Web from supporting other browsers, but it is likely referring to WebRTC, an open source technology that enables browsers to support real-time communications. At the time, a Microsoft spokesperson declined to share when the change would occur.
Last month, Microsoft started warning Firefox, Safari, and Opera users that Skype for Web, first unveiled in 2014, would no longer support their browsers and that they must use Edge or Chrome instead.
The change, though upsetting for many, does not come as a surprise.