Hello! I finished my first project in the Responsive web design certification today. I wanted to let you know that the note stating that the tests will only work in Chrome are possibly incorrect. I was able to run the tests in Firefox with no issues. Figured I’d try it as I don’t have Chrome and didn’t want to install just for that. 
You may want to test, then review/revise the notes. Thanks!
Thank you for helping make FCC better. Bugs can be reported as GitHub Issues. Whenever reporting a bug, please check first that there isn’t already an issue for it and provide as much detail as possible.