UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36

Steps to reproduce the problem:
1. Open a web page.
2. Open DevTools (F12)
3. Choose a page (e.g. tinhtinh.vn > index
4. Right click to show context menu

What is the expected behavior?
The menuitem "Map to File System Resources" will appear.

What went wrong?
The functionality "Map to File System Resources" is missing.

Did this work before? N/A 

Chrome version: 65.0.3325.181  Channel: stable
OS Version: 10.0
Flash Version: 

Please read in this article https://developers.google.com/web/tools/setup/setup-workflow
And look at on the photo in section "Stage persisted changes". I need this feature.