neowin[.]net/news/mozilla-bypasses-microsoft-makes-it-easier-to-set-firefox-as-default-browser-in-windows/
If you use Windows you know Microsoft wants you to use Edge, and it's even more of a PITA to change the default browser in Win11. Mozilla came up with a one-click workaround that Microsoft says is unsupported. While it works for now, no telling if Microsoft will break it in a future Windows update -- if they don't, Firefox is open source, so we could see this being added to every other browser too.