UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36

Steps to reproduce the problem:
1. Download the Imagus browser extension - https://chrome.google.com/webstore/detail/imagus/immpkjjlgappgfkkfieppnmlhakdmaab?hl=en and enable it.
2. Take the two files attached and put them in a directory together.
3. Run a local server in that directory and go to `localhost:{port}/window.html`
4. Click the button on the page to perform a postMessage with transferrable objects

Error - The browser tab will crash.

What is the expected behavior?
I should be able to transfer an ArrayBuffer to the child iFrame using the Transferrable Objects API.

What went wrong?
Something about using iFrame Transferrable Objects and the Imagus extension is causing the browser tab to crash. I posted a bug report about this to the Imagus devs (https://www.reddit.com/r/imagus/comments/6mn1af/extension_causes_tab_to_crash_when_interacting/) but it seems like the browser crashing might not be the problem of the extension (at least fully). 

I installed this extension to Firefox as well and it doesn't exhibit this behavior. 

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 59.0.3071.115  Channel: stable
OS Version: OS X 10.12.5
Flash Version:
 

Deleted: frame.html 294 bytes

frame.html 294 bytes View Download

Deleted: window.html 556 bytes

window.html 556 bytes View Download