I honestly wonder how it would feel to be an "Edge as main browser" person. I open it up every 2 weeks for LinkedIn (too lazy for an extra firefox profile there) and yes, it wants to be my default browser, every second time it also wants me to configure something from MS, or import something or WTF. Barely usable if I have to close 4 dialogs to open a website.
I use it as a work main because it's a Microsoft ecosystem with Teams, ADO, SharePoint, etc., and I learned a very long time ago that there are consequences to shunning slices of the Microsoft ecosystem for preference. I spot legit little quality of life integrations occasionally, but on the balance, I have no idea if it has been worth it to deal with some of the bugs and occasionally terrible design decisions that come and go. It's, at least, nice to stay aware and be reminded that my persistently disdainful view of Microsoft over the years actually extends to the poor quality of their recent offerings. I still keep Firefox running for personal browsing. Is this stupid? Maybe. I cannot recommend it.
Google services like YouTube and Gmail may not work smoothly with Firefox because Google slows them down. If you don’t use Google services (which most people do), you don’t need to worry.