Firefox gives Oops! try again with no other details.
Workaround 2 fixed it for me. That's a very ugly hack and still required.
What does it take to get this fixed after 157 days of inactivity?
There is always hope, but this issue has existed since the day this course was created (several years ago) so at this rate I expect it to remain this way until it is retired.
Easy hack on this bug. Copy your code before you delete everything but your style tags. Move on to the next lesson and paste it back in the editor. No muss, no fuss. Thanks for the heads up on the workarounds!
Thanks for the Workaround 2. It worked for me.