So I’m using the most current version of firefox (desktop) and have went round and round with this. Still get the error “TL;DR: Try turning off your ad blocker.” Even though I have been to many sites and followed their step. Disabled tracking feature (little shield top left corner) and made sure java was allowed. Could sure use help.
Also try restarting Firefox with add-ons disabled (go to about:profiles under the Restart section)