Runtime Error on Firefox
I started using Sololearn about 2 months ago and had no problems. I use it between computer and phone often. Yesterday after doing a few questions on HTML I clicked on Code Playground and got this error: https://i.imgur.com/JxEGRG8.png on Firefox. I'm typing this out on Internet Explorer, the only page that doesn't error on Firefox is my profile. I do use add-ons such as NoScirpt but I have Sololearn white listed. How can I fix this?