Mastodon is a great example of pathetic web design. More than a few times has it completely failed to work for me at all just as in your case.
Every single instance I've used has presented me with the same warning: "To use the Mastodon web application, please enable JavaScript" as I have JS disabled by default. Please, PLEASE tell my why I can't see anything on the page without Javascript. What amazing cutting-edge Twitter-busting follower-thrusting technologies could Mastodon possibly be using that it needs me to turn on JS to see absolutely anything?