Windows 11 refuses to make Firefox my default browser

Recently I decided to make the decision to change my browser to Firefox after my 16 year-old-son said it was "based". When navigating to the download page from Microsoft Edge, it claimed that Edge was better than Firefox because it had 60% of the features and none of the privacy. Despite the tempting claims, I proceeded anyway and set Firefox as my default browser. After a couple of days, I went to turn on my computer, and it said it was "installing updates"; when it booted on, Firefox was gone from my computer, and Edge was set as the default browser! I brushed this off as a bug, but the same thing happened four days later! What did I do wrong?