UserAgent: Mozilla/5.0 (X11; Linux x86_64; rv:51.0) Gecko/20100101 Firefox/51.0

Example URL:
	data:text/html,<script>var c = 0; var node = document.createElement('div'); var appendNode = function() { console.log(++c); document.documentElement.appendChild(node); }; var observer = new MutationObserver(appendNode); observer.observe(document.documentElement, { childList: true }); appendNode(); </script>

Steps to reproduce the problem:
1. load 	data:text/html,<script>var c = 0; var node = document.createElement('div'); var appendNode = function() { console.log(++c); document.documentElement.appendChild(node); }; var observer = new MutationObserver(appendNode); observer.observe(document.documentElement, { childList: true }); appendNode(); </script>
2. looks at the web console

What is the expected behavior?
The script should lead to endless loop, so some warning should be shown to user about slow script or the child process should be killed.

What went wrong?
MutationObserver just stops working without any exceptions or warnings.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? N/A 

Did this work before? N/A 

Does this work in other browsers? N/A 

Chrome version:   Channel: n/a
OS Version: 
Flash Version: