Is there a way to configure firefox using about:config to allow local file access (for demo purposes)?
Specifically using FF12, I need to be able to
You can flip the security.fileuri.strict_origin_policy preference in about:config. But that opens up some security holes; moving your JSON to be in a child directory of the directory the HTML is in is a much better idea.
security.fileuri.strict_origin_policy
about:config