[ubuntu-uk] Square in top left slow to load when launching Firefox

[Rowan Berkeley]

Hi,

This deserves a thread of its own, I think. 'Slow to load' means 
approximately a half-second late. During that half-second, the previous 
display remains visible in the square. It's approx 250x250 pixels in 
size, I should say, ie about the width of a tab in the browser tab bar. 
I've got this identical effect on two machines, a Lenovo N500 and a 
Lenovo S206, both running Ubuntu 12.10. I don't think it happens in 
older versions of Ubuntu. I've searched Launchpad, but I can't find this 
exactly; there are a few reports of top left Firefox problems, but not 
this exactly.