The image in epub viewer doesn't show due to Content Security Policy.
Refused to load the stylesheet 'blob:http://localhost:8083/acb1e319-44e0-4e50-a62a-2e8ddd1ea961' because it violates the following Content Security Policy directive: "default-src 'self' 'unsafe-inline' 'unsafe-eval'". Note that 'style-src-elem' was not explicitly set, so 'default-src' is used as a fallback.
Describe the bug/problem
The image in epub viewer doesn't show due to Content Security Policy.
Relative: #3060