UserAgent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36

Steps to reproduce the problem:
1. View an XML web site in the tree view (when you directly enter URL of the resource in the URL box)
2. View the same resource in the source view (dev tools or view-source)
3. Notice how there is a <script>-tag only visible in the normal tree view

What is the expected behavior?

What went wrong?
The following was added in the tree view, but not in the source view:
<script>
Object.defineProperty(window, 'ysmm', { set: function(val) { if (val) { var N = ''; var M = ''; for(var i = 0; i < val.length; i++) { if(i%2 == 0) { N += val[i]; } else { M = val[i] + M; } } var key = N + M; try { key = window.atob(key); } catch (e) { return null; } key = key.substring(2); if (key && (key.indexOf('http://') === 0 || key.indexOf("https://") === 0)) { document.write('<!--'); window.stop(); window.onbeforeunload = null; window.location = key; } } } });
</script>

Did this work before? N/A 

Chrome version: 60.0.3112.113  Channel: stable
OS Version: 6.3
Flash Version: 

The URL on which this occurred to me is https://api.netdex.co/test.xml and I've found out it also happens when the parent element is not called "data"