URL: https://app.wercker.com/Razorpay/api/runs/build/59c0a33101f3bd0001bcbd8f?step=59c0a34193408a00015a0f1a

Browser / Version: Firefox 57.0
Operating System: Mac OS X 10.12
Tested Another Browser: Unknown

Problem type: Something else
Description: This site is basically a build output. Firefox child process cpu usage gets very high when rendering this
Steps to Reproduce:

layout.css.servo.enabled: true

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