UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.75 Safari/537.36

Steps to reproduce the problem:
1. install chrome data saver https://chrome.google.com/webstore/detail/data-saver/pfmgfdlgomnbgkofeojodiodmgpgmkac?hl=en
2. open devtools
3. visit http://isfiberreadyyet.com/

What is the expected behavior?
The page is rendered

What went wrong?
chrome refuses to execute scripts/stylesheets

Failed to find a valid digest in the 'integrity' attribute for resource 'http://isfiberreadyyet.com/static/css/main.a4a4fce6.css' with computed SHA-256 integrity '/zMod6KZq5cHhfLg9h4b6HazBiGOPf3QkVxI2fYasf8='. The resource has been blocked.
Failed to find a valid digest in the 'integrity' attribute for resource 'http://isfiberreadyyet.com/static/js/main.a792f434.js' with computed SHA-256 integrity '4eGRlbKHACzQWBuMxzPBLvDfNLP/5dgae/UKgLwUcm4='. The resource has been blocked.

Did this work before? Yes 

Chrome version: 55.0.2883.75  Channel: stable
OS Version: OS X 10.12.1
Flash Version: Shockwave Flash 23.0 r0

this website was built with CRA which enabled subresource integrity recently. Disabling the data saver extension fixes the issue