Diễn đàn hỗ trợ Firefox

When I launch teams or slack from firefox on windows, I presume that a slack:// and teams:// or equivalent url is launched by the webpage.

As a developer working on Browser Picker, it would be quite handy if I could inspect these urls that gets launched, is there a way I can see the actual protocol url that got launched somewhere?

I have Yahoo.com on my desktop which takes me to my email account. I would like to get it on my task bar but when I try and move it down it is adding it to Firefox on the task bar. I can't seem to get it down there to stay