We check this website, now jsmediaperf.fr is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is jsmediaperf Down Right Now? - NO! jsmediaperf is up!
If you have problem with access to site jsmediaperf, and domain jsmediaperf.fr is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).