CONSOLE ERROR: Refused to load 'http://web-platform.test:8001/plugins/resources/mock-plugin.pl' (MIME type '') because it violates the following Content Security Policy Directive: 'plugin-types application/x-invalid-type'. When enforcing the 'plugin-types' directive, the plugin's media type must be explicitly declared with a 'type' attribute on the containing element (e.g. '<object type="[TYPE GOES HERE]" ...>').

