You should contact microsoft support since that is their program for questions.

Normally, you do not need to remove Microsoft Edge to simply make Firefox your default browser. See Make Firefox your default browser on Windows.

That said, certain built-in features of Windows will ignore your default browser and exclusively use Edge. You could check the article Setting Firefox as the default browser does not work - What to do and see whether there is a fix there. Otherwise, you could submit the question to Google or Perplexity. Not sure Bing will give you a helpful answer. ;-)

Regarding Co-Pilot, there was a way to remove it from the Windows 11 Taskbar. But I removed it about a year ago and don't recall the steps. This forum focuses on Mozilla products, and there are better forums for Windows feature support.

Remove copilot from my desktop. Screwing up my emails for yahoo.