Solve CORS issues without proxy

[freemvmt]

Although cors-anywhere proxy solves the CORS origin problem, it produces a different issue with too many requests coming from that domain (presumably because of other people using it for the same purpose).

Therefore it would be useful to solve this problem more deliberately. @redahaq suggests this article: https://chrome.google.com/webstore/detail/moesif-orign-cors-changer/digfbfaphojjndkpccljibejjbppifbc