Live Preview failing in Safari and Firefox only New Craft user here and I am working on wrapping up my first Craft site and am running into a Live Preview error.

When Live Preview is activated in either Firefox or Safari, I just get a blank white page and am getting this error thrown in the console:


  XMLHttpRequest cannot load http://mysite.com/section/slug. Cross-origin redirection denied by Cross-Origin Resource Sharing policy.


I'm not really sure what that is other than it sounds like I need to give something access that doesn't have it.   And I'm not sure why this error doesn't get thrown in for Chrome or IE.

Any help would be appreciated!
CORS (or Cross-Origin Resource Sharing) issues usually occur when you are attempting to load a resource such as a font, a stylesheet, or a script from a remote location that does not give your domain explicit permission to access it. Thinking the resource is unsafe, your browser will block it.  

Are these pages attempting to load any resources from remote locations such as a CDN or web storage like an S3 bucket? If so, you may need to edit your CORS policy for those services to mark your resources as "safe" for your domain.