Try this, for the text-size:
Go to about:config (link doesn't work properly it seems!)
Press button saying you'll be careful.
Type "size" into the search bar at the top.

- are there any items in bold?
These are the ones that are non-default.

Having said that, I wonder if there's a way to re-install microB without flashing the device?
Or, better still, is there a means to update those parts that have been improved by Mozilla like replacing Gecko 1.9.2 with the current (HTML5) one?