Getting usable resolution in B2G

I downloaded the Mac OS X B2G (Boot to Gecko) client (see this) but the emulated device resolution was poor.

A quick way of getting better resolution is to start the client from the command line like this:

/Applications/B2G.app/Contents/MacOS/b2g-bin --screen=ipad \

-profile /Applications/B2G.app/Contents/MacOS/gaia/profile