Create extension in javascript.

Please let me know I'm created a google chrome extension it's working but one issue faeced

Refused to load the script 'code.jquery.com/jquery-3.4.1.min.js' because it violates the following Content Security Policy directive: "script-src 'self'". Note that 'script-src-elem' was not explicitly set, so 'script-src' is used as a fallback.