If you are getting a black screen when using Firefox on your tablet you will need to change the zoom mode. Start Firefox and in the toolbar tray near the time select the zoom icon (four arrows pointing out) select 'Stretch to fill the screen' instead of 'Zoom to fill the screen'. You will then need to restart the tablet to fully reset the preference.

Unfortunately Android suggests Zoom when starting Firefox for the first time on a tablet. We are working to put out a tablet mode that will remove this 'suggestion that Android makes.