A new feature of Visual Studio 2017 is really annoying: Whenever you run a web application, it opens a different browser (Google Chrome or Internet Explorer). Not just a new window, but an entirely different executable without your plugins or your settings for self-signed SSL certificates on localhost. To make things worse, those alternative browsers are (at least on my machine) unbearable slow.
This is a side effect of the new capabilities to debug JavaScript. To fully integrate the debugging experience, Visual Studio ships its own version of Google Chrome and Internet Explorer. If you don’t need to debug JavaScript and want your “old” browser back, then it only takes a few clicks to disable it.
In the menu of Visual Studio 2017 you click on Tools -> Options. The settings dialog opens and you need to find the Debugging section. Search in the right panel for the option “Enable JavaScript debugging for ASP.NET (Chrome and IE)” and uncheck it:
The next time you start your web application Visual Studio should open it in your normal web browser. Should this not be the case, restart Visual Studio and try again.
If you need to debug JavaScript, you can activate it by simply checking that option again.