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Then Microsoft will either tell you to use Edge and Bing (or else!), or just set this automatically.
I had this issue on the windows box at work. For some time, whenever I opened Firefox, it told me that it was not set as the default browser. I fixed this, only to get the same message again the next day.
Are you sure it’s not just your IT locking in the default browser? I for sure never had this problem before.
Nope. At least not on purpose. And for some reason, it only happened on my PC.
I’d say it might be a borked install, then. I’ve had some windows installation that doesn’t lock in settings properly, which is fixed after a reinstall. The reinstall is mostly because I’m too lazy to troubleshoot the actual reason.