[NTLUG:Discuss] show firefox/mozilla 'size'

[Jack Snodgrass]

I want to test out some web pages with different sized browser windows. 
I have a large screen and when my browser is full screen, (1600x1200)
I can see a lot of stuff. If I got to a user's office and look at what
they see,
it's remarkably different. 

Is there an easy way in mozilla or firefox to resize your window 
so it shows you what a user might see in 800x600 resolution or 
640x480 ( oh my god... ) resolution? I know I can just make it 
smaller... but how do I tell how small I need to make it? 

I can probably load a fixed size image and shrink by window
to fit it, but is thre a way to just re-size my window and see a 
XxY number some where? 

Thanks - jack