End support for IE and fully embrace MS Edge. Submit a bug/feature request opens Internet Explorer rather than Microsoft Edge. I actually find this rather upsetting because I've received notice that Adobe will be increasing subscription rates, but can be bothered to keep core programs updated. At the same time it looks like they can create new programs that I don't use. It seems subscriptions are subsidizing pet projects rather than core users/uses.
Preferences > Real Time Preview. In the browser list, change the Primary checkbox to your preferred browser. This also changes the browser it opens for bug report, help etc.
But I agree, why on earth did they leave Explorer the default...