Preview redirects to HomePage

[alexlopezleon (hhhhaaarry Brown)]

I'm going to test the solution in this post. I'm using firefox dev edition and i set the enhanded security to the highest tier.

Preview mode issue Firefox

We’re trying to get our pages set up to support preview and are running into issues, specifically with Firefox (Chrome works fine). I’m getting this error in the Firefox console: Cookie "io.prismic.preview" has been rejected for invalid domain. Is there something we have to do to allow the prismic.js file to set the io.prismic.preview cookie? We've gone through all the documentation on how to set up previews and none of the Troubleshooting steps seem to help either. Thanks! David