I've been back to FF since Quantum release and like the new experience so far. Occasionally, I have to use Chrome since some of the internal websites at work do

I've been back to FF since Quantum release and like the new experience so far. Occasionally, I have to use Chrome since some of the internal websites at work don't work with Firefox. I always get those errors related to cross-site scripting issue like this: "Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://internal-xxxxxxx https://internal-xxxxxxx. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing)." Does anybody know what kind of knob I have to turn on/off in FF to make this disappear?