Microsoft proves the critics right: We’re heading toward a Chrome-only Web - Ars Technica

Even though Skype for Web seems to work in Firefox, Microsoft won't let you use it. .....
https://arstechnica.com/gadgets/2019/03/microsofts-new-skype-for-web-client-an-early-taste-of-the-browser-monoculture/

Skype bug could allow malicious attacker 'system' level access, Microsoft says fix is 'too much work' -- 9to5Mac

A nasty Skype bug could allow a malicious attacker to gain "system" level access, if exploited. The bug is applicable on both macOS and Windows desktop platforms. However, Microsoft says that fixing the bug will take "too much work", stating that it would require a full rewrite of the application to fix the bug...
https://9to5mac.com/2018/02/13/skype-bug-grants-system-access-microsoft-too-lazy-to-fix/