This is probably a no brainer for most but I needed to change my default browser in Visual Studio to Firefox and it took me a long time to find it. Of course once I found it I saw how simple it was to do. Well if anyone else is stuck with this all you need to do is the following.
In the solution explorer window right click on any .aspx page and select “browse with” . You’ll see a list of browsers. if firefox isn’t there just add it in. Then click the “Set As Default” button and your done. Told you it was easy peasy 
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