vncviewer on windows connecting to linux box

I'm just starting to use vncviewer and I'm having a problem resizing windows on the client side. For example firefox defaults to a small window and I can't resize it. I have tried the following. First of all server startup:

vncserver :6 -geometry 1024x768 &

for xterms this works but the font is too small and I can't change that:
```
xterm -geometry 160x50
```
for firefox this doesn't work:
```
firefox -height xx -width yy
```
the window remains too small and anchored top/left

So, how do I get firefox to be larger?

thanks, Paul.

Update:

The particular linux box seems to have a pretty barebones install and a lot of utilities are missing so I just tried a few different things and this worked for firefox:

firefox -safe-mode

I'm not sure what's causing the problem but in safe mode the browser window is pretty close to fullscreen so that will work for me.

Solution

For xterm you also want to take a look at the -fn option. In a running xterm you can also use Ctrl plus the right mouse button to get a font menu.

Firefox appears to have not bothered with any useful options. You might be able to use something like wmctrl after the fact.