Quote - Are the programmers blind?

Probably not, but they are something else when it comes to HTML layout and use of CSS.  

Quote - I'm not certain but I though the maximum avatar width was 130 pixels. So why is the cell taking up so much realestate that could be better used for the posts? Surely a cell width of the maximum avatar width plus 10 pixels would be adequate!

Well the cell is sytled with a width of 150 pixels.  

The problem is that for some reason (which I haven't completely figured out yet) FF is expanding that cell.
It would appear to be something to do with the message cell not being wide enough.
I had to set it's width to 90% in my stylesheet to stop the avatar cell growing beyond what's necessary, as no variation of sizing the avatar cell itself would work.