UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36

Steps to reproduce the problem:
1. Install the Zero Dark Matrix extension: https://chrome.google.com/webstore/detail/devtools-theme-zero-dark/bomhdjeadceaggdgfoefmpeafkjhegbo
2. Open the Extensions tab and observe the state of the extension
3. Open Devtools
4. Observe the "This extension may have been corrupted" message that appears under the extension name header

What is the expected behavior?
The error & error message should not appear. 

What went wrong?
I'm not sure what's triggering this error to come up. I loaded the current state of the extension on m59 (previous stable), m61(Canary) and m62(Chromium) and cannot reproduce this behavior.

Did this work before? N/A 

Chrome version: 60.0.3112.90  Channel: stable
OS Version: OS X 10.11.6
Flash Version: