How to pass GET parameters to jsFiddle

I’m a big fan of Stack Overflow and I tend to contribute regularly (am currently in the top 0.X%). In this category (stackoverflow) of posts I will will be posting my top rated questions and answers. This, btw, is allowed as explained in the meta thread here.

My quesiton was:

How to pass GET parameters to jsFiddle? I tried http://jsfiddle.net/mKwcF/?id=123 but all I get ishttp://fiddle.jshell.net/mKwcF/show/

My example js is simple on a given link above:

alert(window.location.href);

The (updated) answer, by Jack Miller, was:

As of October 2014 it is a little more complicated than it used to be:

If your jsfiddle url is:

http://jsfiddle.net/u7G7n/41

Some code to make stackoverflow happy. Ignore this.

use instead (including some url parameters):

http://fiddle.jshell.net/u7G7n/41/show/light/?lat1=52&lng1=9&lat2=50&lng2=1

AND send the same url (including parameters) as referer. You can use Referer Control as Chrome plugin: https://chrome.google.com/webstore/detail/referer-control/hnkcfpcejkafcihlgbojoidoihckciin

And configure like this: 

Now the second link (including parameters) should work.