GXT seems to be broken on Firefox on Android, but not for GWT on same browser/device.
I tested both of the following GXT 3.1 sites using FF 16.0.1 on Android 4.0.3 on Asus TF101 and got only blank screen:
Whereas using the same browser and device (as above) I was able to successfully view/interact with the widgets on the following GWT site:
Is this expected? If so is there any plan to support FF on Android later?