Re: The universal solution "Continue Shopping Button"
As to whether this will work at all I don't know, haven't had the time to try it as am presently overloaded. It looks as though it should work though.
But depending on how your cart is set up, I would consider adding some restrictions to "if ($mode == "add")".
In my case for example, I have the ability to "add to cart" from the actual cart page, so I would add the restriction that if I am already on that page, the back_url variable shouldn't change. There might be other cases where you don't want the variable changed, in which case you should add these restrictions as well.
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