URL: https://meet.google.com/unsupported?meetingCode=xma-nphv-dpz&ref=https://meet.google.com/xma-nphv-dpz

Browser / Version: Firefox 59.0
Operating System: Windows 8.1
Tested Another Browser: Yes

Problem type: Site is not usable
Description: Website works only for Google Chrome (more data in "steps") .
Steps to Reproduce:
layout.css.servo.enabled: true

I changed User-Agent Switcher into chrome, it works on Firefox. While looking on the html I found in the script part, ugly displayed, this line:

function(){var a;if(window!=window.top&&(!kc()||window.frames!=window.top))if(.D(.og,4)){if(kc()&&0<=.Sb(.Paa(),9)||_.Wb("Firefox")&&

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