Skype vs. Firefox as an unsupported browser

Today I wanted to login to skype web client. Unfortunately showed me the following nice bullshit:

I was using skype web a few days ago, and now firefox is not supported.  Shall I use Microsoft Edge? Really? Shame on you, damned fools!

Fear not however, because Mozilla has a nice addon to set the User-Agent. So I’ve installed the addon, then faked Windows / Edge 17, and finally I was in, and could use skype web just like before.