firefox dogfooding on 0.9.10 - png bux FIXED.

[Segin]

As of 0.9.10, the bug which caused all PNGs in Firefox to appear inverse 
is fixed.

Also, for developers with slower machines, try using Mozilla 1.7.x, it's 
much much faster than Firefox. It may not have *as many* bugs, but it 
still brings up the same exact OLE problems which Firefox does, so using 
it is just as useful here.