Microphone behavior bug
I'm seeing the behavior, that on the voice-input questions, the microphone works on a few questions, but then on some random question, the microphone icon will stay non-clickable (grayed), and I am forced to use the option of not using the microphone, thereby disabling the microphone in the settings, to avoid losing my progress in the lesson.
After the lesson, I then have to go to settings to re-enable the microphone.
I am currently using the latest version of Firefox (29.0.1), but I've seen the same issue while using earlier versions of Firefox, or with Chrome as well.
Kindly look into this glitchy behavior.