Launching MS Edge when Mozilla Firefox is default browser

The URI field contains the website URL that you want to log into. Clicking on it launches the default browser which, in my case is Mozilla Firefox. However, some web sites do not work correctly with Firefox and require MS Edge. Is there a way to launch Edge for just those web sites by specifying which browser app should be run?

FYI - this is my first time in your forum and I have no idea what “cloud-default” means but the forum wouldn’t allow me to post anything until I selected something in “Hosting” so if cloud-default doesn’t make sense, please allow for my ignorance.