Long story short: That pop-up you get when you open Firefox (or whatever other browser) for the first time asking you if you want to make it your default browser won’t work anymore. They’re forcing you to go through their convoluted control panel where you have to change it like 20 times for each file extension.
I’ve been using a streamed pc service for windows things and it is nice. It isn’t the cheapest thing ever and it eats data at incredible rates, but if you have uncapped internet and a cost-permitting reason to need windows it works, at least in my experience