UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.76 Safari/537.36

Example URL:
https://jsonformatter.curiousconcept.com/

Steps to reproduce the problem:
1. Get JSON file which is at least 130K large (https://www.mockaroo.com/ can generate the file)

2. Copy it into the clipboard (the xsel utility can help with that on Unix)

3. Try to paste the text into the text area in https://jsonformatter.curiousconcept.com/ or http://jsonprettyprint.com/

What is the expected behavior?
The text will be pasted.

What went wrong?
The page becomes unresponsive, and eventually has to be killed.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 56.0.2924.76  Channel: stable
OS Version: Fedora 25
Flash Version: Shockwave Flash 24.0 r0

Works fine with Konqueror 4.14.25 and Firefox 51.0.1

Attached is a JSON file of random data which is big enough to cause the problem.