The Firefox SEC_ERROR_OCSP_FUTURE_RESPONSE error message generally appears when a user tries to access the HTTPs or secured sites while the system’s time and date are misconfigured. Sometimes this issue can also appear if the user using an old version of Firefox like the build 47 or even older.
https://danielssmiths896.wordpress.com/2020/03/02/how-to-fix-sec_error_ocsp_future_response-error-on-firefox/