UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Steps to reproduce the problem:
1. Enforce URLBlacklist policy and add chrome://extensions/?id=nihecfncajkmcfebflmfffpgmbgjnhdf
2. now try to open the details page of above extension
3. The details page is displayed

What is the expected behavior?
The details page should not be displayed

What went wrong?
The details page is displayed

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 69.0.3497.100  Channel: stable
OS Version: 
Flash Version: