Had a derp moment.
Forgot to try disabling adblock in Firefox.
It worked, apparently adblock was blocking the text box at the top to type in your name on startup & giving me the "error occurred, please restart" message.

So yeah if you have adblock enabled on your browser & are getting the error message on startup, try disabling your adblock.

After I finish the tutorial I'll try enabling adblock again to see if I run into anymore issues & report back.