This is working as intended. Artery aka BrowserLink is a real-time connection from Visual Studio to all browsers running your code. It essentially allows Visual Studio to interact with every browser.
For instance if you have IE, Opera, Chrome and Firefox all running your code and you’re trying to ensure cross browser correctness; instead of going to each browser and hitting f5 to refresh you can just click the browser link refresh button which will auto-refresh all of the pages for you.
Not everyone wants or needs to have this functionality so if you do want to disable it, as Gustavo Armenta said you can disable it by following the steps here: How can I disable __vwd/js/artery in VS.NET 2013?
Hope this helps!