current security headers prevent images from loading images inlined in css, leading to errors such as:

jquery.js?27d9:10220 Refused to load the image 'data:image/gif;base64,R0lGODlhEAAQAPQAAP///wAAAPDw8IqKiuDg4EZGRnp6egAAAFhYW…zsPgMCEAY7Cg04Uk48LAsDhRA8MVQPEF0GAgqYYwSRlycNcWskCkApIyEAOwAAAAAAAAAAAA==' because it violates the following Content Security Policy directive: "img-src 'self' *.gravatar.com".