The test is on Firefox 24, 25 and 27a1 and the simulator in the versions 4 and 5pre6
Sometimes it works but most all the time it fails to start
The log error: http://pastebin.com/PRwKPufK
Same here, I can open the index page but when I press "Connect" or "Refresh" it crashes like it happens for @elalecs
We are facing some crashes, happening only on MacOS Maverick, when starting the simulation process.
More info about this failure over here:
I'm going to close this github bug as this issue is tracked on bugzilla. I suggest you to track bugzilla if you want updates about this crash.
Thanks for the report.