UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36
Platform: 10895.60

Steps to reproduce the problem:
1. Run Files app in chromeos
2. Select "Install new from the webstore" from right upper side (three point dot icon) 
3. Try install some extension.

What is the expected behavior?
Extension should be installed.

What went wrong?
error message "install failed"

WebStore page: 

Did this work before? N/A 

Chrome version: 69.0.3497.101  Channel: stable
OS Version: 69.0.3497.101
Flash Version: